25493551 has 2 divisors, whose sum is σ = 25493552. Its totient is φ = 25493550.

The previous prime is 25493527. The next prime is 25493561. The reversal of 25493551 is 15539452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25493551 - 2⁵ = 25493519 is a prime.

It is a super-2 number, since 2×25493551² = 1299842285179202, which contains 22 as substring.

It is equal to p_1594807 and since 25493551 and 1594807 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 (25493521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746775 + 12746776.

It is an arithmetic number, because the mean of its divisors is an integer number (12746776).

Almost surely, 2^25493551 is an apocalyptic number.

25493551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493551 is an equidigital number, since it uses as much as digits as its factorization.

25493551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 25493551 is about 5049.1138826531. The cubic root of 25493551 is about 294.3134508439.

The spelling of 25493551 in words is "twenty-five million, four hundred ninety-three thousand, five hundred fifty-one".