161970225 has 24 divisors (see below), whose sum is σ = 273494400. Its totient is φ = 84544320.

The previous prime is 161970223. The next prime is 161970227. The reversal of 161970225 is 522079161.

161970225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161970223) and next prime (161970227).

It is not a de Polignac number, because 161970225 - 2¹ = 161970223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161970223) 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, 19450 + ... + 26499.

It is an arithmetic number, because the mean of its divisors is an integer number (11395600).

Almost surely, 2^161970225 is an apocalyptic number.

161970225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161970225 is a deficient number, since it is larger than the sum of its proper divisors (111524175).

161970225 is a wasteful number, since it uses less digits than its factorization.

161970225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46009 (or 46004 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 161970225 is about 12726.7523351403. The cubic root of 161970225 is about 545.1027777998.

The spelling of 161970225 in words is "one hundred sixty-one million, nine hundred seventy thousand, two hundred twenty-five".