721141541 has 4 divisors (see below), whose sum is σ = 721822284. Its totient is φ = 720460800.

The previous prime is 721141511. The next prime is 721141583. The reversal of 721141541 is 145141127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145141127 = 839 ⋅172993.

It can be written as a sum of positive squares in 2 ways, for example, as 473236516 + 247905025 = 21754^2 + 15745^2 .

It is a cyclic number.

It is not a de Polignac number, because 721141541 - 2²⁶ = 654032677 is a prime.

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 721141541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721141501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338780 + ... + 340901.

It is an arithmetic number, because the mean of its divisors is an integer number (180455571).

Almost surely, 2^721141541 is an apocalyptic number.

It is an amenable number.

721141541 is a deficient number, since it is larger than the sum of its proper divisors (680743).

721141541 is a wasteful number, since it uses less digits than its factorization.

721141541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680742.

The product of its digits is 1120, while the sum is 26.

The square root of 721141541 is about 26854.0786660053. The cubic root of 721141541 is about 896.7543757955.

Adding to 721141541 its reverse (145141127), we get a palindrome (866282668).

The spelling of 721141541 in words is "seven hundred twenty-one million, one hundred forty-one thousand, five hundred forty-one".