172561137 has 8 divisors (see below), whose sum is σ = 262950336. Its totient is φ = 98606352.

The previous prime is 172561117. The next prime is 172561141. The reversal of 172561137 is 731165271.

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

It is not a de Polignac number, because 172561137 - 2⁶ = 172561073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172561098 and 172561107.

It is not an unprimeable number, because it can be changed into a prime (172561117) 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, 4108578 + ... + 4108619.

It is an arithmetic number, because the mean of its divisors is an integer number (32868792).

Almost surely, 2^172561137 is an apocalyptic number.

It is an amenable number.

172561137 is a deficient number, since it is larger than the sum of its proper divisors (90389199).

172561137 is an equidigital number, since it uses as much as digits as its factorization.

172561137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8217207.

The product of its digits is 8820, while the sum is 33.

The square root of 172561137 is about 13136.2527761915. The cubic root of 172561137 is about 556.7338972828.

The spelling of 172561137 in words is "one hundred seventy-two million, five hundred sixty-one thousand, one hundred thirty-seven".