157212507 has 4 divisors (see below), whose sum is σ = 209616680. Its totient is φ = 104808336.

The previous prime is 157212499. The next prime is 157212557. The reversal of 157212507 is 705212751.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 157212507 - 2³ = 157212499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157212557) 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 in 3 ways as a sum of consecutive naturals, for example, 26202082 + ... + 26202087.

It is an arithmetic number, because the mean of its divisors is an integer number (52404170).

Almost surely, 2^157212507 is an apocalyptic number.

157212507 is a deficient number, since it is larger than the sum of its proper divisors (52404173).

157212507 is an equidigital number, since it uses as much as digits as its factorization.

157212507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52404172.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 157212507 is about 12538.4411710547. The cubic root of 157212507 is about 539.7123605289.

The spelling of 157212507 in words is "one hundred fifty-seven million, two hundred twelve thousand, five hundred seven".