31740381 has 6 divisors (see below), whose sum is σ = 45847230. Its totient is φ = 21160248.

The previous prime is 31740367. The next prime is 31740389. The reversal of 31740381 is 18304713.

It can be written as a sum of positive squares in only one way, i.e., 29877156 + 1863225 = 5466^2 + 1365^2 .

It is not a de Polignac number, because 31740381 - 2¹⁴ = 31723997 is a prime.

It is a super-2 number, since 2×31740381² = 2014903572050322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31740389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1763346 + ... + 1763363.

It is an arithmetic number, because the mean of its divisors is an integer number (7641205).

Almost surely, 2^31740381 is an apocalyptic number.

It is an amenable number.

31740381 is a deficient number, since it is larger than the sum of its proper divisors (14106849).

31740381 is a wasteful number, since it uses less digits than its factorization.

31740381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526715 (or 3526712 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 31740381 is about 5633.8602219082. The cubic root of 31740381 is about 316.6192957149.

The spelling of 31740381 in words is "thirty-one million, seven hundred forty thousand, three hundred eighty-one".