31484381 has 4 divisors (see below), whose sum is σ = 31714332. Its totient is φ = 31254432.

The previous prime is 31484377. The next prime is 31484413. The reversal of 31484381 is 18348413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23921881 + 7562500 = 4891^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 31484381 - 2² = 31484377 is a prime.

It is a super-2 number, since 2×31484381² = 1982532493906322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31484081) 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, 114770 + ... + 115043.

It is an arithmetic number, because the mean of its divisors is an integer number (7928583).

Almost surely, 2^31484381 is an apocalyptic number.

It is an amenable number.

31484381 is a deficient number, since it is larger than the sum of its proper divisors (229951).

31484381 is a wasteful number, since it uses less digits than its factorization.

31484381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229950.

The product of its digits is 9216, while the sum is 32.

The square root of 31484381 is about 5611.0944565209. The cubic root of 31484381 is about 315.7657727237.

The spelling of 31484381 in words is "thirty-one million, four hundred eighty-four thousand, three hundred eighty-one".