161520970 has 32 divisors (see below), whose sum is σ = 313845840. Its totient is φ = 59496960.

The previous prime is 161520899. The next prime is 161520971. The reversal of 161520970 is 79025161.

It can be written as a sum of positive squares in 8 ways, for example, as 31036041 + 130484929 = 5571^2 + 11423^2 .

It is not an unprimeable number, because it can be changed into a prime (161520971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64950 + ... + 67390.

Almost surely, 2^161520970 is an apocalyptic number.

161520970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161520970 is a deficient number, since it is larger than the sum of its proper divisors (152324870).

161520970 is a wasteful number, since it uses less digits than its factorization.

161520970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 161520970 is about 12709.0900539732. The cubic root of 161520970 is about 544.5983292932.

The spelling of 161520970 in words is "one hundred sixty-one million, five hundred twenty thousand, nine hundred seventy".