161621854 has 8 divisors (see below), whose sum is σ = 245754000. Its totient is φ = 79703856.

The previous prime is 161621819. The next prime is 161621881. The reversal of 161621854 is 458126161.

161621854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161621854² = 52243247380794632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553354 + ... + 553645.

It is an arithmetic number, because the mean of its divisors is an integer number (30719250).

Almost surely, 2^161621854 is an apocalyptic number.

161621854 is a deficient number, since it is larger than the sum of its proper divisors (84132146).

161621854 is a wasteful number, since it uses less digits than its factorization.

161621854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107074.

The product of its digits is 11520, while the sum is 34.

The square root of 161621854 is about 12713.0584046483. The cubic root of 161621854 is about 544.7116888223.

The spelling of 161621854 in words is "one hundred sixty-one million, six hundred twenty-one thousand, eight hundred fifty-four".