31648861 has 4 divisors (see below), whose sum is σ = 32669824. Its totient is φ = 30627900.

The previous prime is 31648853. The next prime is 31648867. The reversal of 31648861 is 16884613.

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 31648861 - 2³ = 31648853 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 31648861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31648867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510435 + ... + 510496.

It is an arithmetic number, because the mean of its divisors is an integer number (8167456).

Almost surely, 2^31648861 is an apocalyptic number.

31648861 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31648861 is a deficient number, since it is larger than the sum of its proper divisors (1020963).

31648861 is a wasteful number, since it uses less digits than its factorization.

31648861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020962.

The product of its digits is 27648, while the sum is 37.

The square root of 31648861 is about 5625.7320412547. The cubic root of 31648861 is about 316.3146901155.

The spelling of 31648861 in words is "thirty-one million, six hundred forty-eight thousand, eight hundred sixty-one".