31498921 has 8 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 31067568.

The previous prime is 31498913. The next prime is 31498931. The reversal of 31498921 is 12989413.

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 31498921 - 2³ = 31498913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31498931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24390 + ... + 25648.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^31498921 is an apocalyptic number.

It is an amenable number.

31498921 is a deficient number, since it is larger than the sum of its proper divisors (434519).

31498921 is a wasteful number, since it uses less digits than its factorization.

31498921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its digits is 15552, while the sum is 37.

The square root of 31498921 is about 5612.3899543777. The cubic root of 31498921 is about 315.8143738353.

It can be divided in two parts, 314 and 98921, that added together give a triangular number (99235 = T₄₄₅).

The spelling of 31498921 in words is "thirty-one million, four hundred ninety-eight thousand, nine hundred twenty-one".