925751721 has 4 divisors (see below), whose sum is σ = 1234335632. Its totient is φ = 617167812.

The previous prime is 925751699. The next prime is 925751731. The reversal of 925751721 is 127157529.

It is a happy number.

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 925751721 - 2⁶ = 925751657 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 925751721.

It is not an unprimeable number, because it can be changed into a prime (925751731) 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, 154291951 + ... + 154291956.

It is an arithmetic number, because the mean of its divisors is an integer number (308583908).

Almost surely, 2^925751721 is an apocalyptic number.

It is an amenable number.

925751721 is a deficient number, since it is larger than the sum of its proper divisors (308583911).

925751721 is a wasteful number, since it uses less digits than its factorization.

925751721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308583910.

The product of its digits is 44100, while the sum is 39.

The square root of 925751721 is about 30426.1683588322. The cubic root of 925751721 is about 974.6114501753.

The spelling of 925751721 in words is "nine hundred twenty-five million, seven hundred fifty-one thousand, seven hundred twenty-one".