31929997 has 8 divisors (see below), whose sum is σ = 35000352. Its totient is φ = 28887600.

The previous prime is 31929991. The next prime is 31930057. The reversal of 31929997 is 79992913.

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

It is a cyclic number.

It is not a de Polignac number, because 31929997 - 2²³ = 23541389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31929997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31929991) 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, 4558 + ... + 9199.

It is an arithmetic number, because the mean of its divisors is an integer number (4375044).

Almost surely, 2^31929997 is an apocalyptic number.

It is an amenable number.

31929997 is a deficient number, since it is larger than the sum of its proper divisors (3070355).

31929997 is a wasteful number, since it uses less digits than its factorization.

31929997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13979.

The product of its digits is 275562, while the sum is 49.

The square root of 31929997 is about 5650.6634123791. The cubic root of 31929997 is about 317.2485354665.

The spelling of 31929997 in words is "thirty-one million, nine hundred twenty-nine thousand, nine hundred ninety-seven".