25131961 has 2 divisors, whose sum is σ = 25131962. Its totient is φ = 25131960.

The previous prime is 25131959. The next prime is 25131973. The reversal of 25131961 is 16913152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24561936 + 570025 = 4956^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131961 - 2¹ = 25131959 is a prime.

Together with 25131959, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25131761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565980 + 12565981.

It is an arithmetic number, because the mean of its divisors is an integer number (12565981).

Almost surely, 2^25131961 is an apocalyptic number.

It is an amenable number.

25131961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131961 is an equidigital number, since it uses as much as digits as its factorization.

25131961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 25131961 is about 5013.1787321020. The cubic root of 25131961 is about 292.9153463309.

The spelling of 25131961 in words is "twenty-five million, one hundred thirty-one thousand, nine hundred sixty-one".