161775351 has 6 divisors (see below), whose sum is σ = 233675520. Its totient is φ = 107850228.

The previous prime is 161775343. The next prime is 161775401. The reversal of 161775351 is 153577161.

161775351 is a `hidden beast` number, since 1 + 617 + 7 + 5 + 35 + 1 = 666.

It is not a de Polignac number, because 161775351 - 2³ = 161775343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161775751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8987511 + ... + 8987528.

It is an arithmetic number, because the mean of its divisors is an integer number (38945920).

Almost surely, 2^161775351 is an apocalyptic number.

161775351 is a deficient number, since it is larger than the sum of its proper divisors (71900169).

161775351 is a wasteful number, since it uses less digits than its factorization.

161775351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17975045 (or 17975042 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 161775351 is about 12719.0939535802. The cubic root of 161775351 is about 544.8840771318.

It can be divided in two parts, 16177 and 5351, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 161775351 in words is "one hundred sixty-one million, seven hundred seventy-five thousand, three hundred fifty-one".