161547975 has 144 divisors (see below), whose sum is σ = 334264320. Its totient is φ = 74131200.

The previous prime is 161547961. The next prime is 161548039. The reversal of 161547975 is 579745161.

161547975 is a `hidden beast` number, since 16 + 1 + 547 + 97 + 5 = 666.

It is not a de Polignac number, because 161547975 - 2²² = 157353671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161547975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3048049 + ... + 3048101.

It is an arithmetic number, because the mean of its divisors is an integer number (2321280).

Almost surely, 2^161547975 is an apocalyptic number.

161547975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161547975 is an abundant number, since it is smaller than the sum of its proper divisors (172716345).

161547975 is a wasteful number, since it uses less digits than its factorization.

161547975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 134 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 161547975 is about 12710.1524381103. The cubic root of 161547975 is about 544.6286784141.

The spelling of 161547975 in words is "one hundred sixty-one million, five hundred forty-seven thousand, nine hundred seventy-five".