31345129 has 4 divisors (see below), whose sum is σ = 31464576. Its totient is φ = 31225684.

The previous prime is 31345121. The next prime is 31345141. The reversal of 31345129 is 92154313.

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 31345129 - 2³ = 31345121 is a prime.

It is a super-2 number, since 2×31345129² = 1965034224053282, 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 = 31345097 and 31345106.

It is not an unprimeable number, because it can be changed into a prime (31345121) 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, 59329 + ... + 59854.

It is an arithmetic number, because the mean of its divisors is an integer number (7866144).

Almost surely, 2^31345129 is an apocalyptic number.

It is an amenable number.

31345129 is a deficient number, since it is larger than the sum of its proper divisors (119447).

31345129 is a wasteful number, since it uses less digits than its factorization.

31345129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119446.

The product of its digits is 3240, while the sum is 28.

The square root of 31345129 is about 5598.6720746977. The cubic root of 31345129 is about 315.2995521185.

The spelling of 31345129 in words is "thirty-one million, three hundred forty-five thousand, one hundred twenty-nine".