172015261 has 4 divisors (see below), whose sum is σ = 187653024. Its totient is φ = 156377500.

The previous prime is 172015201. The next prime is 172015273. The reversal of 172015261 is 162510271.

172015261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172015261 - 2²¹ = 169918109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172015201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7818865 + ... + 7818886.

It is an arithmetic number, because the mean of its divisors is an integer number (46913256).

Almost surely, 2^172015261 is an apocalyptic number.

172015261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172015261 is a deficient number, since it is larger than the sum of its proper divisors (15637763).

172015261 is a wasteful number, since it uses less digits than its factorization.

172015261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15637762.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 172015261 is about 13115.4588558693. The cubic root of 172015261 is about 556.1462240272.

The spelling of 172015261 in words is "one hundred seventy-two million, fifteen thousand, two hundred sixty-one".