31138061 has 4 divisors (see below), whose sum is σ = 31165824. Its totient is φ = 31110300.

The previous prime is 31138057. The next prime is 31138073. The reversal of 31138061 is 16083113.

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 31138061 - 2² = 31138057 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 (31138001) 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, 12125 + ... + 14466.

It is an arithmetic number, because the mean of its divisors is an integer number (7791456).

Almost surely, 2^31138061 is an apocalyptic number.

It is an amenable number.

31138061 is a deficient number, since it is larger than the sum of its proper divisors (27763).

31138061 is a wasteful number, since it uses less digits than its factorization.

31138061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27762.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 31138061 is about 5580.1488331406. The cubic root of 31138061 is about 314.6037210456.

The spelling of 31138061 in words is "thirty-one million, one hundred thirty-eight thousand, sixty-one".