161615051 has 4 divisors (see below), whose sum is σ = 174046992. Its totient is φ = 149183112.

The previous prime is 161615021. The next prime is 161615117. The reversal of 161615051 is 150516161.

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

It is not a de Polignac number, because 161615051 - 2¹⁰ = 161614027 is a prime.

It is a super-2 number, since 2×161615051² = 52238849419465202, which contains 22 as substring.

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 161615051.

It is not an unprimeable number, because it can be changed into a prime (161615021) 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, 6215951 + ... + 6215976.

It is an arithmetic number, because the mean of its divisors is an integer number (43511748).

Almost surely, 2^161615051 is an apocalyptic number.

161615051 is a deficient number, since it is larger than the sum of its proper divisors (12431941).

161615051 is a wasteful number, since it uses less digits than its factorization.

161615051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12431940.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 161615051 is about 12712.7908422974. The cubic root of 161615051 is about 544.7040460324.

It can be divided in two parts, 16161 and 5051, that added together give a palindrome (21212).

The spelling of 161615051 in words is "one hundred sixty-one million, six hundred fifteen thousand, fifty-one".