31028129 has 8 divisors (see below), whose sum is σ = 33895488. Its totient is φ = 28168560.

The previous prime is 31028093. The next prime is 31028143. The reversal of 31028129 is 92182013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31028129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31028098 and 31028107.

It is not an unprimeable number, because it can be changed into a prime (31028149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9179 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (4236936).

Almost surely, 2^31028129 is an apocalyptic number.

It is an amenable number.

31028129 is a deficient number, since it is larger than the sum of its proper divisors (2867359).

31028129 is a wasteful number, since it uses less digits than its factorization.

31028129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31028129 is about 5570.2898488319. The cubic root of 31028129 is about 314.2330514575.

The spelling of 31028129 in words is "thirty-one million, twenty-eight thousand, one hundred twenty-nine".