721740741 has 4 divisors (see below), whose sum is σ = 962320992. Its totient is φ = 481160492.

The previous prime is 721740731. The next prime is 721740751. The reversal of 721740741 is 147047127.

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.

It is an interprime number because it is at equal distance from previous prime (721740731) and next prime (721740751).

It is a cyclic number.

It is not a de Polignac number, because 721740741 - 2²² = 717546437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721740731) 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, 120290121 + ... + 120290126.

It is an arithmetic number, because the mean of its divisors is an integer number (240580248).

Almost surely, 2^721740741 is an apocalyptic number.

It is an amenable number.

721740741 is a deficient number, since it is larger than the sum of its proper divisors (240580251).

721740741 is a wasteful number, since it uses less digits than its factorization.

721740741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240580250.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 721740741 is about 26865.2329414803. The cubic root of 721740741 is about 897.0026795544.

Adding to 721740741 its reverse (147047127), we get a palindrome (868787868).

The spelling of 721740741 in words is "seven hundred twenty-one million, seven hundred forty thousand, seven hundred forty-one".