25401631 has 2 divisors, whose sum is σ = 25401632. Its totient is φ = 25401630.

The previous prime is 25401611. The next prime is 25401653. The reversal of 25401631 is 13610452.

It is an a-pointer prime, because the next prime (25401653) can be obtained adding 25401631 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25401631 - 2²³ = 17013023 is a prime.

It is a super-2 number, since 2×25401631² = 1290485714920322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25401611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700815 + 12700816.

It is an arithmetic number, because the mean of its divisors is an integer number (12700816).

Almost surely, 2^25401631 is an apocalyptic number.

25401631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25401631 is an equidigital number, since it uses as much as digits as its factorization.

25401631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 25401631 is about 5040.0030753959. The cubic root of 25401631 is about 293.9592975877.

It can be divided in two parts, 254016 and 31, that multiplied together give a triangular number (7874496 = T₃₉₆₈).

The spelling of 25401631 in words is "twenty-five million, four hundred one thousand, six hundred thirty-one".