161392751 has 4 divisors (see below), whose sum is σ = 173807592. Its totient is φ = 148977912.

The previous prime is 161392739. The next prime is 161392757. The reversal of 161392751 is 157293161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157293161 = 47 ⋅3346663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161392751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161392757) 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, 6207401 + ... + 6207426.

It is an arithmetic number, because the mean of its divisors is an integer number (43451898).

Almost surely, 2^161392751 is an apocalyptic number.

161392751 is a deficient number, since it is larger than the sum of its proper divisors (12414841).

161392751 is a wasteful number, since it uses less digits than its factorization.

161392751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12414840.

The product of its digits is 11340, while the sum is 35.

The square root of 161392751 is about 12704.0446708912. The cubic root of 161392751 is about 544.4541863205.

The spelling of 161392751 in words is "one hundred sixty-one million, three hundred ninety-two thousand, seven hundred fifty-one".