31390129 has 4 divisors (see below), whose sum is σ = 32120176. Its totient is φ = 30660084.

The previous prime is 31390127. The next prime is 31390141. The reversal of 31390129 is 92109313.

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 31390129 - 2¹ = 31390127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31390097 and 31390106.

It is not an unprimeable number, because it can be changed into a prime (31390127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364959 + ... + 365044.

It is an arithmetic number, because the mean of its divisors is an integer number (8030044).

Almost surely, 2^31390129 is an apocalyptic number.

It is an amenable number.

31390129 is a deficient number, since it is larger than the sum of its proper divisors (730047).

31390129 is an equidigital number, since it uses as much as digits as its factorization.

31390129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730046.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 31390129 is about 5602.6894434727. The cubic root of 31390129 is about 315.4503644447.

The spelling of 31390129 in words is "thirty-one million, three hundred ninety thousand, one hundred twenty-nine".