172644461 has 16 divisors (see below), whose sum is σ = 191946048. Its totient is φ = 153964800.

The previous prime is 172644449. The next prime is 172644473. The reversal of 172644461 is 164446271.

It is an interprime number because it is at equal distance from previous prime (172644449) and next prime (172644473).

It is not a de Polignac number, because 172644461 - 2¹⁰ = 172643437 is a prime.

It is a super-2 number, since 2×172644461² = 59612219827961042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172644421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318851 + ... + 319391.

It is an arithmetic number, because the mean of its divisors is an integer number (11996628).

Almost surely, 2^172644461 is an apocalyptic number.

172644461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172644461 is a deficient number, since it is larger than the sum of its proper divisors (19301587).

172644461 is a wasteful number, since it uses less digits than its factorization.

172644461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052.

The product of its digits is 32256, while the sum is 35.

The square root of 172644461 is about 13139.4239219229. The cubic root of 172644461 is about 556.8234922546.

The spelling of 172644461 in words is "one hundred seventy-two million, six hundred forty-four thousand, four hundred sixty-one".