25289731 has 2 divisors, whose sum is σ = 25289732. Its totient is φ = 25289730.

The previous prime is 25289699. The next prime is 25289767. The reversal of 25289731 is 13798252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25289731 - 2⁵ = 25289699 is a prime.

It is a super-2 number, since 2×25289731² = 1279140988104722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25289791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12644865 + 12644866.

It is an arithmetic number, because the mean of its divisors is an integer number (12644866).

Almost surely, 2^25289731 is an apocalyptic number.

25289731 is a deficient number, since it is larger than the sum of its proper divisors (1).

25289731 is an equidigital number, since it uses as much as digits as its factorization.

25289731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 25289731 is about 5028.8896388766. The cubic root of 25289731 is about 293.5270095207.

The spelling of 25289731 in words is "twenty-five million, two hundred eighty-nine thousand, seven hundred thirty-one".