925205257721 has 2 divisors, whose sum is σ = 925205257722. Its totient is φ = 925205257720.

The previous prime is 925205257649. The next prime is 925205257729. The reversal of 925205257721 is 127752502529.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924936133696 + 269124025 = 961736^2 + 16405^2 .

It is an emirp because it is prime and its reverse (127752502529) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 925205257721 - 2³⁰ = 924131515897 is a prime.

It is a super-2 number, since 2×925205257721² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (925205257729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 462602628860 + 462602628861.

It is an arithmetic number, because the mean of its divisors is an integer number (462602628861).

Almost surely, 2^925205257721 is an apocalyptic number.

It is an amenable number.

925205257721 is a deficient number, since it is larger than the sum of its proper divisors (1).

925205257721 is an equidigital number, since it uses as much as digits as its factorization.

925205257721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 925205257721 in words is "nine hundred twenty-five billion, two hundred five million, two hundred fifty-seven thousand, seven hundred twenty-one".