161107551 has 24 divisors (see below), whose sum is σ = 254367360. Its totient is φ = 97448400.

The previous prime is 161107549. The next prime is 161107601. The reversal of 161107551 is 155701161.

It is a happy number.

161107551 is a `hidden beast` number, since 1 + 6 + 1 + 107 + 551 = 666.

It is not a de Polignac number, because 161107551 - 2¹ = 161107549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161107511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61180 + ... + 63758.

It is an arithmetic number, because the mean of its divisors is an integer number (10598640).

Almost surely, 2^161107551 is an apocalyptic number.

161107551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161107551 is a deficient number, since it is larger than the sum of its proper divisors (93259809).

161107551 is a wasteful number, since it uses less digits than its factorization.

161107551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227 (or 3224 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 27.

The square root of 161107551 is about 12692.8149360179. The cubic root of 161107551 is about 544.1332923359.

The spelling of 161107551 in words is "one hundred sixty-one million, one hundred seven thousand, five hundred fifty-one".