491202157 has 2 divisors, whose sum is σ = 491202158. Its totient is φ = 491202156.

The previous prime is 491202139. The next prime is 491202167. The reversal of 491202157 is 751202194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302029641 + 189172516 = 17379^2 + 13754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491202157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491202167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245601078 + 245601079.

It is an arithmetic number, because the mean of its divisors is an integer number (245601079).

Almost surely, 2^491202157 is an apocalyptic number.

It is an amenable number.

491202157 is a deficient number, since it is larger than the sum of its proper divisors (1).

491202157 is an equidigital number, since it uses as much as digits as its factorization.

491202157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 491202157 is about 22163.0809455725. The cubic root of 491202157 is about 789.0177168090.

The spelling of 491202157 in words is "four hundred ninety-one million, two hundred two thousand, one hundred fifty-seven".