161021445 has 32 divisors (see below), whose sum is σ = 280180992. Its totient is φ = 78492672.

The previous prime is 161021437. The next prime is 161021453. The reversal of 161021445 is 544120161.

It is a happy number.

161021445 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 (161021437) and next prime (161021453).

It is not a de Polignac number, because 161021445 - 2³ = 161021437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16077 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (8755656).

Almost surely, 2^161021445 is an apocalyptic number.

161021445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161021445 is a deficient number, since it is larger than the sum of its proper divisors (119159547).

161021445 is a wasteful number, since it uses less digits than its factorization.

161021445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8141.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 161021445 is about 12689.4225636945. The cubic root of 161021445 is about 544.0363353848.

Subtracting from 161021445 its product of nonzero digits (960), we obtain a triangular number (161020485 = T₁₇₉₄₅).

The spelling of 161021445 in words is "one hundred sixty-one million, twenty-one thousand, four hundred forty-five".