25515473 has 2 divisors, whose sum is σ = 25515474. Its totient is φ = 25515472.

The previous prime is 25515439. The next prime is 25515491. The reversal of 25515473 is 37451552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25472209 + 43264 = 5047^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 25515473 - 2²² = 21321169 is a prime.

It is not a weakly prime, because it can be changed into another prime (25515493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12757736 + 12757737.

It is an arithmetic number, because the mean of its divisors is an integer number (12757737).

Almost surely, 2^25515473 is an apocalyptic number.

It is an amenable number.

25515473 is a deficient number, since it is larger than the sum of its proper divisors (1).

25515473 is an equidigital number, since it uses as much as digits as its factorization.

25515473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 32.

The square root of 25515473 is about 5051.2842921380. The cubic root of 25515473 is about 294.3977870878.

The spelling of 25515473 in words is "twenty-five million, five hundred fifteen thousand, four hundred seventy-three".