997500157 has 2 divisors, whose sum is σ = 997500158. Its totient is φ = 997500156.

The previous prime is 997500089. The next prime is 997500167. The reversal of 997500157 is 751005799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 756195001 + 241305156 = 27499^2 + 15534^2 .

It is a cyclic number.

It is not a de Polignac number, because 997500157 - 2²³ = 989111549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997500167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498750078 + 498750079.

It is an arithmetic number, because the mean of its divisors is an integer number (498750079).

Almost surely, 2^997500157 is an apocalyptic number.

It is an amenable number.

997500157 is a deficient number, since it is larger than the sum of its proper divisors (1).

997500157 is an equidigital number, since it uses as much as digits as its factorization.

997500157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 997500157 is about 31583.2258802042. The cubic root of 997500157 is about 999.1660236768.

The spelling of 997500157 in words is "nine hundred ninety-seven million, five hundred thousand, one hundred fifty-seven".