31340137 has 4 divisors (see below), whose sum is σ = 31351636. Its totient is φ = 31328640.

The previous prime is 31340093. The next prime is 31340143. The reversal of 31340137 is 73104313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25110121 + 6230016 = 5011^2 + 2496^2 .

It is a cyclic number.

It is not a de Polignac number, because 31340137 - 2⁷ = 31340009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31340167) 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, 913 + ... + 7969.

It is an arithmetic number, because the mean of its divisors is an integer number (7837909).

Almost surely, 2^31340137 is an apocalyptic number.

It is an amenable number.

31340137 is a deficient number, since it is larger than the sum of its proper divisors (11499).

31340137 is an equidigital number, since it uses as much as digits as its factorization.

31340137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11498.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 31340137 is about 5598.2262369433. The cubic root of 31340137 is about 315.2828131123.

The spelling of 31340137 in words is "thirty-one million, three hundred forty thousand, one hundred thirty-seven".