161211379 has 4 divisors (see below), whose sum is σ = 184241584. Its totient is φ = 138181176.

The previous prime is 161211361. The next prime is 161211397. The reversal of 161211379 is 973112161.

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

It is an interprime number because it is at equal distance from previous prime (161211361) and next prime (161211397).

It is not a de Polignac number, because 161211379 - 2⁹ = 161210867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161211379.

It is not an unprimeable number, because it can be changed into a prime (161211359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11515092 + ... + 11515105.

It is an arithmetic number, because the mean of its divisors is an integer number (46060396).

Almost surely, 2^161211379 is an apocalyptic number.

161211379 is a deficient number, since it is larger than the sum of its proper divisors (23030205).

161211379 is an equidigital number, since it uses as much as digits as its factorization.

161211379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23030204.

The product of its digits is 2268, while the sum is 31.

The square root of 161211379 is about 12696.9043077437. The cubic root of 161211379 is about 544.2501586546.

The spelling of 161211379 in words is "one hundred sixty-one million, two hundred eleven thousand, three hundred seventy-nine".