172365961 has 4 divisors (see below), whose sum is σ = 172975312. Its totient is φ = 171756612.

The previous prime is 172365959. The next prime is 172365971. The reversal of 172365961 is 169563271.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169563271 = 53 ⋅3199307.

It is a cyclic number.

It is not a de Polignac number, because 172365961 - 2¹ = 172365959 is a prime.

It is a super-2 number, since 2×172365961² = 59420049022907042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172365971) 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, 304251 + ... + 304816.

It is an arithmetic number, because the mean of its divisors is an integer number (43243828).

Almost surely, 2^172365961 is an apocalyptic number.

It is an amenable number.

172365961 is a deficient number, since it is larger than the sum of its proper divisors (609351).

172365961 is an equidigital number, since it uses as much as digits as its factorization.

172365961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609350.

The product of its digits is 68040, while the sum is 40.

The square root of 172365961 is about 13128.8217673941. The cubic root of 172365961 is about 556.5239193584.

The spelling of 172365961 in words is "one hundred seventy-two million, three hundred sixty-five thousand, nine hundred sixty-one".