31431029 has 4 divisors (see below), whose sum is σ = 35921184. Its totient is φ = 26940876.

The previous prime is 31431017. The next prime is 31431031. The reversal of 31431029 is 92013413.

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 31431029 - 2⁴ = 31431013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31430995 and 31431013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431229) 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, 2245067 + ... + 2245080.

It is an arithmetic number, because the mean of its divisors is an integer number (8980296).

Almost surely, 2^31431029 is an apocalyptic number.

It is an amenable number.

31431029 is a deficient number, since it is larger than the sum of its proper divisors (4490155).

31431029 is an equidigital number, since it uses as much as digits as its factorization.

31431029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490154.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31431029 is about 5606.3382880451. The cubic root of 31431029 is about 315.5873111093.

The spelling of 31431029 in words is "thirty-one million, four hundred thirty-one thousand, twenty-nine".