172154961 has 24 divisors (see below), whose sum is σ = 271791936. Its totient is φ = 104137440.

The previous prime is 172154867. The next prime is 172154963. The reversal of 172154961 is 169451271.

It is not a de Polignac number, because 172154961 - 2⁷ = 172154833 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (172154963) 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, 63316 + ... + 65978.

It is an arithmetic number, because the mean of its divisors is an integer number (11324664).

Almost surely, 2^172154961 is an apocalyptic number.

172154961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172154961 is a deficient number, since it is larger than the sum of its proper divisors (99636975).

172154961 is a wasteful number, since it uses less digits than its factorization.

172154961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333 (or 3330 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 172154961 is about 13120.7835512975. The cubic root of 172154961 is about 556.2967389755.

The spelling of 172154961 in words is "one hundred seventy-two million, one hundred fifty-four thousand, nine hundred sixty-one".