210157457 has 2 divisors, whose sum is σ = 210157458. Its totient is φ = 210157456.

The previous prime is 210157399. The next prime is 210157481. The reversal of 210157457 is 754751012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175536001 + 34621456 = 13249^2 + 5884^2 .

It is a cyclic number.

It is not a de Polignac number, because 210157457 - 2⁶ = 210157393 is a prime.

It is equal to p_11609825 and since 210157457 and 11609825 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (210157487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105078728 + 105078729.

It is an arithmetic number, because the mean of its divisors is an integer number (105078729).

Almost surely, 2^210157457 is an apocalyptic number.

It is an amenable number.

210157457 is a deficient number, since it is larger than the sum of its proper divisors (1).

210157457 is an equidigital number, since it uses as much as digits as its factorization.

210157457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 210157457 is about 14496.8085108413. The cubic root of 210157457 is about 594.5407156417.

The spelling of 210157457 in words is "two hundred ten million, one hundred fifty-seven thousand, four hundred fifty-seven".