157505891 has 2 divisors, whose sum is σ = 157505892. Its totient is φ = 157505890.

The previous prime is 157505851. The next prime is 157505893. The reversal of 157505891 is 198505751.

157505891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157505891 - 2⁶ = 157505827 is a prime.

Together with 157505893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157505893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78752945 + 78752946.

It is an arithmetic number, because the mean of its divisors is an integer number (78752946).

Almost surely, 2^157505891 is an apocalyptic number.

157505891 is a deficient number, since it is larger than the sum of its proper divisors (1).

157505891 is an equidigital number, since it uses as much as digits as its factorization.

157505891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 157505891 is about 12550.1350988744. The cubic root of 157505891 is about 540.0478821282.

The spelling of 157505891 in words is "one hundred fifty-seven million, five hundred five thousand, eight hundred ninety-one".