31128429 has 16 divisors (see below), whose sum is σ = 42594048. Its totient is φ = 20212032.

The previous prime is 31128413. The next prime is 31128439. The reversal of 31128429 is 92482113.

It is not a de Polignac number, because 31128429 - 2⁴ = 31128413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31128396 and 31128405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31128439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38659 + ... + 39455.

It is an arithmetic number, because the mean of its divisors is an integer number (2662128).

Almost surely, 2^31128429 is an apocalyptic number.

It is an amenable number.

31128429 is a deficient number, since it is larger than the sum of its proper divisors (11465619).

31128429 is a wasteful number, since it uses less digits than its factorization.

31128429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124.

The product of its digits is 3456, while the sum is 30.

The square root of 31128429 is about 5579.2857069700. The cubic root of 31128429 is about 314.5712786964.

The spelling of 31128429 in words is "thirty-one million, one hundred twenty-eight thousand, four hundred twenty-nine".