925157821 has 4 divisors (see below), whose sum is σ = 1057323232. Its totient is φ = 792992412.

The previous prime is 925157791. The next prime is 925157839. The reversal of 925157821 is 128751529.

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 a cyclic number.

It is not a de Polignac number, because 925157821 - 2¹⁵ = 925125053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (925157881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66082695 + ... + 66082708.

It is an arithmetic number, because the mean of its divisors is an integer number (264330808).

Almost surely, 2^925157821 is an apocalyptic number.

It is an amenable number.

925157821 is a deficient number, since it is larger than the sum of its proper divisors (132165411).

925157821 is a wasteful number, since it uses less digits than its factorization.

925157821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132165410.

The product of its digits is 50400, while the sum is 40.

The square root of 925157821 is about 30416.4071020888. The cubic root of 925157821 is about 974.4029905530.

The spelling of 925157821 in words is "nine hundred twenty-five million, one hundred fifty-seven thousand, eight hundred twenty-one".