25391477 has 2 divisors, whose sum is σ = 25391478. Its totient is φ = 25391476.

The previous prime is 25391473. The next prime is 25391479. The reversal of 25391477 is 77419352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 8532241 = 4106^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 25391477 - 2² = 25391473 is a prime.

Together with 25391479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25391477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25391473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695738 + 12695739.

It is an arithmetic number, because the mean of its divisors is an integer number (12695739).

Almost surely, 2^25391477 is an apocalyptic number.

It is an amenable number.

25391477 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391477 is an equidigital number, since it uses as much as digits as its factorization.

25391477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 25391477 is about 5038.9956340525. The cubic root of 25391477 is about 293.9201234560.

The spelling of 25391477 in words is "twenty-five million, three hundred ninety-one thousand, four hundred seventy-seven".