157161619 has 4 divisors (see below), whose sum is σ = 157429944. Its totient is φ = 156893296.

The previous prime is 157161577. The next prime is 157161647. The reversal of 157161619 is 916161751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916161751 = 433 ⋅2115847.

It is a cyclic number.

It is not a de Polignac number, because 157161619 - 2¹¹ = 157159571 is a prime.

It is a super-2 number, since 2×157161619² = 49399548973402322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157161649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133282 + ... + 134455.

It is an arithmetic number, because the mean of its divisors is an integer number (39357486).

Almost surely, 2^157161619 is an apocalyptic number.

157161619 is a deficient number, since it is larger than the sum of its proper divisors (268325).

157161619 is an equidigital number, since it uses as much as digits as its factorization.

157161619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268324.

The product of its digits is 11340, while the sum is 37.

The square root of 157161619 is about 12536.4117274442. The cubic root of 157161619 is about 539.6541212132.

It can be divided in two parts, 1571 and 61619, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 157161619 in words is "one hundred fifty-seven million, one hundred sixty-one thousand, six hundred nineteen".