31498561 has 8 divisors (see below), whose sum is σ = 33235200. Its totient is φ = 29769840.

The previous prime is 31498559. The next prime is 31498591. The reversal of 31498561 is 16589413.

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 31498561 - 2¹ = 31498559 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 31498561.

It is not an unprimeable number, because it can be changed into a prime (31498541) 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, 7371 + ... + 10831.

It is an arithmetic number, because the mean of its divisors is an integer number (4154400).

Almost surely, 2^31498561 is an apocalyptic number.

It is an amenable number.

31498561 is a deficient number, since it is larger than the sum of its proper divisors (1736639).

31498561 is a wasteful number, since it uses less digits than its factorization.

31498561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959.

The product of its digits is 25920, while the sum is 37.

The square root of 31498561 is about 5612.3578823878. The cubic root of 31498561 is about 315.8131706871.

The spelling of 31498561 in words is "thirty-one million, four hundred ninety-eight thousand, five hundred sixty-one".