25531553 has 2 divisors, whose sum is σ = 25531554. Its totient is φ = 25531552.

The previous prime is 25531549. The next prime is 25531567. The reversal of 25531553 is 35513552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24433249 + 1098304 = 4943^2 + 1048^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531553 - 2² = 25531549 is a prime.

It is not a weakly prime, because it can be changed into another prime (25531523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765776 + 12765777.

It is an arithmetic number, because the mean of its divisors is an integer number (12765777).

Almost surely, 2^25531553 is an apocalyptic number.

It is an amenable number.

25531553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531553 is an equidigital number, since it uses as much as digits as its factorization.

25531553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11250, while the sum is 29.

The square root of 25531553 is about 5052.8757158672. The cubic root of 25531553 is about 294.4596178355.

The spelling of 25531553 in words is "twenty-five million, five hundred thirty-one thousand, five hundred fifty-three".