31431429 has 16 divisors (see below), whose sum is σ = 46719040. Its totient is φ = 20885040.

The previous prime is 31431403. The next prime is 31431443. The reversal of 31431429 is 92413413.

It is not a de Polignac number, because 31431429 - 2¹³ = 31423237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431469) 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, 7179 + ... + 10695.

It is an arithmetic number, because the mean of its divisors is an integer number (2919940).

Almost surely, 2^31431429 is an apocalyptic number.

It is an amenable number.

31431429 is a deficient number, since it is larger than the sum of its proper divisors (15287611).

31431429 is a wasteful number, since it uses less digits than its factorization.

31431429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857 (or 3851 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31431429 is about 5606.3739618402. The cubic root of 31431429 is about 315.5886498542.

The spelling of 31431429 in words is "thirty-one million, four hundred thirty-one thousand, four hundred twenty-nine".