161613977 has 16 divisors (see below), whose sum is σ = 188006400. Its totient is φ = 136070928.

The previous prime is 161613971. The next prime is 161613979. The reversal of 161613977 is 779316161.

It is a happy number.

It is not a de Polignac number, because 161613977 - 2⁶ = 161613913 is a prime.

It is a super-2 number, since 2×161613977² = 52238155123513058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161613971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94274 + ... + 95972.

It is an arithmetic number, because the mean of its divisors is an integer number (11750400).

Almost surely, 2^161613977 is an apocalyptic number.

It is an amenable number.

161613977 is a deficient number, since it is larger than the sum of its proper divisors (26392423).

161613977 is a wasteful number, since it uses less digits than its factorization.

161613977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940.

The product of its digits is 47628, while the sum is 41.

The square root of 161613977 is about 12712.7486013057. The cubic root of 161613977 is about 544.7028394339.

The spelling of 161613977 in words is "one hundred sixty-one million, six hundred thirteen thousand, nine hundred seventy-seven".