157218641 has 4 divisors (see below), whose sum is σ = 161053284. Its totient is φ = 153384000.

The previous prime is 157218583. The next prime is 157218653. The reversal of 157218641 is 146812751.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6027025 + 151191616 = 2455^2 + 12296^2 .

It is a cyclic number.

It is not a de Polignac number, because 157218641 - 2¹⁰ = 157217617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157218671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917260 + ... + 1917341.

It is an arithmetic number, because the mean of its divisors is an integer number (40263321).

Almost surely, 2^157218641 is an apocalyptic number.

It is an amenable number.

157218641 is a deficient number, since it is larger than the sum of its proper divisors (3834643).

157218641 is an equidigital number, since it uses as much as digits as its factorization.

157218641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834642.

The product of its digits is 13440, while the sum is 35.

The square root of 157218641 is about 12538.6857764281. The cubic root of 157218641 is about 539.7193798020.

The spelling of 157218641 in words is "one hundred fifty-seven million, two hundred eighteen thousand, six hundred forty-one".