20251145249 has 2 divisors, whose sum is σ = 20251145250. Its totient is φ = 20251145248.

The previous prime is 20251145227. The next prime is 20251145311. The reversal of 20251145249 is 94254115202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12007776400 + 8243368849 = 109580^2 + 90793^2 .

It is a cyclic number.

It is not a de Polignac number, because 20251145249 - 2²⁸ = 19982709793 is a prime.

It is not a weakly prime, because it can be changed into another prime (20251145449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125572624 + 10125572625.

It is an arithmetic number, because the mean of its divisors is an integer number (10125572625).

Almost surely, 2^20251145249 is an apocalyptic number.

It is an amenable number.

20251145249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20251145249 is an equidigital number, since it uses as much as digits as its factorization.

20251145249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 20251145249 in words is "twenty billion, two hundred fifty-one million, one hundred forty-five thousand, two hundred forty-nine".