25530997 has 2 divisors, whose sum is σ = 25530998. Its totient is φ = 25530996.

The previous prime is 25530977. The next prime is 25531013. The reversal of 25530997 is 79903552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24740676 + 790321 = 4974^2 + 889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25530997 is a prime.

It is equal to p_1596982 and since 25530997 and 1596982 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25530977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765498 + 12765499.

It is an arithmetic number, because the mean of its divisors is an integer number (12765499).

Almost surely, 2^25530997 is an apocalyptic number.

It is an amenable number.

25530997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25530997 is an equidigital number, since it uses as much as digits as its factorization.

25530997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 25530997 is about 5052.8206973927. The cubic root of 25530997 is about 294.4574803400.

The spelling of 25530997 in words is "twenty-five million, five hundred thirty thousand, nine hundred ninety-seven".