721676541 has 4 divisors (see below), whose sum is σ = 962235392. Its totient is φ = 481117692.

The previous prime is 721676521. The next prime is 721676561. The reversal of 721676541 is 145676127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145676127 = 3 ⋅48558709.

It is an interprime number because it is at equal distance from previous prime (721676521) and next prime (721676561).

It is not a de Polignac number, because 721676541 - 2⁶ = 721676477 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721676541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721676521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120279421 + ... + 120279426.

It is an arithmetic number, because the mean of its divisors is an integer number (240558848).

Almost surely, 2^721676541 is an apocalyptic number.

It is an amenable number.

721676541 is a deficient number, since it is larger than the sum of its proper divisors (240558851).

721676541 is a wasteful number, since it uses less digits than its factorization.

721676541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240558850.

The product of its digits is 70560, while the sum is 39.

The square root of 721676541 is about 26864.0380620636. The cubic root of 721676541 is about 896.9760821553.

The spelling of 721676541 in words is "seven hundred twenty-one million, six hundred seventy-six thousand, five hundred forty-one".