715770021 has 4 divisors (see below), whose sum is σ = 954360032. Its totient is φ = 477180012.

The previous prime is 715770007. The next prime is 715770043. The reversal of 715770021 is 120077517.

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 not a de Polignac number, because 715770021 - 2⁷ = 715769893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715770821) 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, 119295001 + ... + 119295006.

It is an arithmetic number, because the mean of its divisors is an integer number (238590008).

Almost surely, 2^715770021 is an apocalyptic number.

It is an amenable number.

715770021 is a deficient number, since it is larger than the sum of its proper divisors (238590011).

715770021 is a wasteful number, since it uses less digits than its factorization.

715770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238590010.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 715770021 is about 26753.8786160063. The cubic root of 715770021 is about 894.5222926377.

The spelling of 715770021 in words is "seven hundred fifteen million, seven hundred seventy thousand, twenty-one".