725771131 has 2 divisors, whose sum is σ = 725771132. Its totient is φ = 725771130.

The previous prime is 725771129. The next prime is 725771143. The reversal of 725771131 is 131177527.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 725771131 - 2¹ = 725771129 is a prime.

It is a super-2 number, since 2×725771131² = 1053487469186038322, which contains 22 as substring.

Together with 725771129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (725771171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362885565 + 362885566.

It is an arithmetic number, because the mean of its divisors is an integer number (362885566).

Almost surely, 2^725771131 is an apocalyptic number.

725771131 is a deficient number, since it is larger than the sum of its proper divisors (1).

725771131 is an equidigital number, since it uses as much as digits as its factorization.

725771131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10290, while the sum is 34.

The square root of 725771131 is about 26940.1397732083. The cubic root of 725771131 is about 898.6692807240.

The spelling of 725771131 in words is "seven hundred twenty-five million, seven hundred seventy-one thousand, one hundred thirty-one".