25857031 has 2 divisors, whose sum is σ = 25857032. Its totient is φ = 25857030.

The previous prime is 25856981. The next prime is 25857047. The reversal of 25857031 is 13075852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25857031 - 2¹³ = 25848839 is a prime.

It is a super-2 number, since 2×25857031² = 1337172104269922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25856984 and 25857002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25857331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12928515 + 12928516.

It is an arithmetic number, because the mean of its divisors is an integer number (12928516).

Almost surely, 2^25857031 is an apocalyptic number.

25857031 is a deficient number, since it is larger than the sum of its proper divisors (1).

25857031 is an equidigital number, since it uses as much as digits as its factorization.

25857031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 25857031 is about 5084.9809242513. The cubic root of 25857031 is about 295.7056019539.

The spelling of 25857031 in words is "twenty-five million, eight hundred fifty-seven thousand, thirty-one".