31363861 has 8 divisors (see below), whose sum is σ = 33395544. Its totient is φ = 29352960.

The previous prime is 31363853. The next prime is 31363873. The reversal of 31363861 is 16836313.

It can be written as a sum of positive squares in 4 ways, for example, as 2954961 + 28408900 = 1719^2 + 5330^2 .

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 31363861 - 2³ = 31363853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31363831) 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, 2020 + ... + 8173.

It is an arithmetic number, because the mean of its divisors is an integer number (4174443).

Almost surely, 2^31363861 is an apocalyptic number.

It is an amenable number.

31363861 is a deficient number, since it is larger than the sum of its proper divisors (2031683).

31363861 is a wasteful number, since it uses less digits than its factorization.

31363861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10391.

The product of its digits is 7776, while the sum is 31.

The square root of 31363861 is about 5600.3447215328. The cubic root of 31363861 is about 315.3623477880.

The spelling of 31363861 in words is "thirty-one million, three hundred sixty-three thousand, eight hundred sixty-one".