31140037 has 4 divisors (see below), whose sum is σ = 31151776. Its totient is φ = 31128300.

The previous prime is 31140029. The next prime is 31140047. The reversal of 31140037 is 73004113.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31140037 - 2³ = 31140029 is a prime.

It is a super-2 number, since 2×31140037² = 1939403808722738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31139996 and 31140023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (7787944).

Almost surely, 2^31140037 is an apocalyptic number.

It is an amenable number.

31140037 is a deficient number, since it is larger than the sum of its proper divisors (11739).

31140037 is an equidigital number, since it uses as much as digits as its factorization.

31140037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11738.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 31140037 is about 5580.3258865410. The cubic root of 31140037 is about 314.6103757503.

The spelling of 31140037 in words is "thirty-one million, one hundred forty thousand, thirty-seven".