161611051 has 8 divisors (see below), whose sum is σ = 188628480. Its totient is φ = 135576168.

The previous prime is 161611049. The next prime is 161611057. The reversal of 161611051 is 150116161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161611051 - 2¹ = 161611049 is a prime.

It is a super-2 number, since 2×161611051² = 52236263610649202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161611057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245281 + ... + 245938.

It is an arithmetic number, because the mean of its divisors is an integer number (23578560).

Almost surely, 2^161611051 is an apocalyptic number.

161611051 is a deficient number, since it is larger than the sum of its proper divisors (27017429).

161611051 is an equidigital number, since it uses as much as digits as its factorization.

161611051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491273.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 161611051 is about 12712.6335194561. The cubic root of 161611051 is about 544.6995521561.

It can be divided in two parts, 1616110 and 51, that added together give a palindrome (1616161).

The spelling of 161611051 in words is "one hundred sixty-one million, six hundred eleven thousand, fifty-one".