25237991 has 2 divisors, whose sum is σ = 25237992. Its totient is φ = 25237990.

The previous prime is 25237973. The next prime is 25238009. The reversal of 25237991 is 19973252.

It is a balanced prime because it is at equal distance from previous prime (25237973) and next prime (25238009).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25237991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25237951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12618995 + 12618996.

It is an arithmetic number, because the mean of its divisors is an integer number (12618996).

Almost surely, 2^25237991 is an apocalyptic number.

25237991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25237991 is an equidigital number, since it uses as much as digits as its factorization.

25237991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 25237991 is about 5023.7427282854. The cubic root of 25237991 is about 293.3266982257.

The spelling of 25237991 in words is "twenty-five million, two hundred thirty-seven thousand, nine hundred ninety-one".