31648745 has 4 divisors (see below), whose sum is σ = 37978500. Its totient is φ = 25318992.

The previous prime is 31648717. The next prime is 31648751. The reversal of 31648745 is 54784613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54784613 = 13 ⋅4214201.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 14500864 = 4141^2 + 3808^2 .

It is a cyclic number.

It is not a de Polignac number, because 31648745 - 2¹² = 31644649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31648699 and 31648708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3164870 + ... + 3164879.

It is an arithmetic number, because the mean of its divisors is an integer number (9494625).

Almost surely, 2^31648745 is an apocalyptic number.

It is an amenable number.

31648745 is a deficient number, since it is larger than the sum of its proper divisors (6329755).

31648745 is an equidigital number, since it uses as much as digits as its factorization.

31648745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6329754.

The product of its digits is 80640, while the sum is 38.

The square root of 31648745 is about 5625.7217314759. The cubic root of 31648745 is about 316.3143036608.

The spelling of 31648745 in words is "thirty-one million, six hundred forty-eight thousand, seven hundred forty-five".