715777421 has 4 divisors (see below), whose sum is σ = 715922844. Its totient is φ = 715632000.

The previous prime is 715777417. The next prime is 715777423. The reversal of 715777421 is 124777517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179854921 + 535922500 = 13411^2 + 23150^2 .

It is a cyclic number.

It is not a de Polignac number, because 715777421 - 2² = 715777417 is a prime.

It is a super-2 number, since 2×715777421² = 1024674632826822482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715777423) 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, 65060 + ... + 75261.

It is an arithmetic number, because the mean of its divisors is an integer number (178980711).

Almost surely, 2^715777421 is an apocalyptic number.

It is an amenable number.

715777421 is a deficient number, since it is larger than the sum of its proper divisors (145423).

715777421 is a wasteful number, since it uses less digits than its factorization.

715777421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145422.

The product of its digits is 96040, while the sum is 41.

The square root of 715777421 is about 26754.0169133534. The cubic root of 715777421 is about 894.5253753049.

The spelling of 715777421 in words is "seven hundred fifteen million, seven hundred seventy-seven thousand, four hundred twenty-one".