172561087 has 8 divisors (see below), whose sum is σ = 177558192. Its totient is φ = 167601600.

The previous prime is 172561073. The next prime is 172561093. The reversal of 172561087 is 780165271.

172561087 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 cyclic number.

It is not a de Polignac number, because 172561087 - 2¹⁵ = 172528319 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 (172561787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37 + ... + 18577.

It is an arithmetic number, because the mean of its divisors is an integer number (22194774).

Almost surely, 2^172561087 is an apocalyptic number.

172561087 is a deficient number, since it is larger than the sum of its proper divisors (4997105).

172561087 is a wasteful number, since it uses less digits than its factorization.

172561087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18809.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 172561087 is about 13136.2508730612. The cubic root of 172561087 is about 556.7338435111.

The spelling of 172561087 in words is "one hundred seventy-two million, five hundred sixty-one thousand, eighty-seven".