161247977 has 4 divisors (see below), whose sum is σ = 175906896. Its totient is φ = 146589060.

The previous prime is 161247971. The next prime is 161247991. The reversal of 161247977 is 779742161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161247977 - 2¹⁴ = 161231593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161247971) 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, 7329443 + ... + 7329464.

It is an arithmetic number, because the mean of its divisors is an integer number (43976724).

Almost surely, 2^161247977 is an apocalyptic number.

It is an amenable number.

161247977 is a deficient number, since it is larger than the sum of its proper divisors (14658919).

161247977 is a wasteful number, since it uses less digits than its factorization.

161247977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14658918.

The product of its digits is 148176, while the sum is 44.

The square root of 161247977 is about 12698.3454434032. The cubic root of 161247977 is about 544.2913405289.

The spelling of 161247977 in words is "one hundred sixty-one million, two hundred forty-seven thousand, nine hundred seventy-seven".