25312161 has 16 divisors (see below), whose sum is σ = 40601600. Its totient is φ = 13702608.

The previous prime is 25312159. The next prime is 25312163. The reversal of 25312161 is 16121352.

It is an interprime number because it is at equal distance from previous prime (25312159) and next prime (25312163).

It is not a de Polignac number, because 25312161 - 2¹ = 25312159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25312163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31321 + ... + 32118.

It is an arithmetic number, because the mean of its divisors is an integer number (2537600).

Almost surely, 2^25312161 is an apocalyptic number.

25312161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25312161 is a deficient number, since it is larger than the sum of its proper divisors (15289439).

25312161 is a wasteful number, since it uses less digits than its factorization.

25312161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63468.

The product of its digits is 360, while the sum is 21.

The square root of 25312161 is about 5031.1192591709. The cubic root of 25312161 is about 293.6137623261.

The spelling of 25312161 in words is "twenty-five million, three hundred twelve thousand, one hundred sixty-one".