31875161 has 4 divisors (see below), whose sum is σ = 32903424. Its totient is φ = 30846900.

The previous prime is 31875149. The next prime is 31875199. The reversal of 31875161 is 16157813.

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 31875161 - 2⁶ = 31875097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31875121) 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, 514085 + ... + 514146.

It is an arithmetic number, because the mean of its divisors is an integer number (8225856).

Almost surely, 2^31875161 is an apocalyptic number.

31875161 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31875161 is a deficient number, since it is larger than the sum of its proper divisors (1028263).

31875161 is a wasteful number, since it uses less digits than its factorization.

31875161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028262.

The product of its digits is 5040, while the sum is 32.

The square root of 31875161 is about 5645.8091536998. The cubic root of 31875161 is about 317.0668191002.

The spelling of 31875161 in words is "thirty-one million, eight hundred seventy-five thousand, one hundred sixty-one".