28431432251 has 2 divisors, whose sum is σ = 28431432252. Its totient is φ = 28431432250.

The previous prime is 28431432223. The next prime is 28431432259. The reversal of 28431432251 is 15223413482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28431432251 - 2⁶ = 28431432187 is a prime.

It is not a weakly prime, because it can be changed into another prime (28431432259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14215716125 + 14215716126.

It is an arithmetic number, because the mean of its divisors is an integer number (14215716126).

Almost surely, 2^28431432251 is an apocalyptic number.

28431432251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28431432251 is an equidigital number, since it uses as much as digits as its factorization.

28431432251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 35.

The spelling of 28431432251 in words is "twenty-eight billion, four hundred thirty-one million, four hundred thirty-two thousand, two hundred fifty-one".