25131791 has 2 divisors, whose sum is σ = 25131792. Its totient is φ = 25131790.

The previous prime is 25131781. The next prime is 25131809. The reversal of 25131791 is 19713152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25131791 - 2¹⁰ = 25130767 is a prime.

It is equal to p_1573724 and since 25131791 and 1573724 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25131751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565895 + 12565896.

It is an arithmetic number, because the mean of its divisors is an integer number (12565896).

Almost surely, 2^25131791 is an apocalyptic number.

25131791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131791 is an equidigital number, since it uses as much as digits as its factorization.

25131791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 25131791 is about 5013.1617767632. The cubic root of 25131791 is about 292.9146858741.

The spelling of 25131791 in words is "twenty-five million, one hundred thirty-one thousand, seven hundred ninety-one".