31458681 has 6 divisors (see below), whose sum is σ = 45440330. Its totient is φ = 20972448.

The previous prime is 31458667. The next prime is 31458689. The reversal of 31458681 is 18685413.

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 11289600 = 4491^2 + 3360^2 .

It is not a de Polignac number, because 31458681 - 2⁹ = 31458169 is a prime.

It is a super-2 number, since 2×31458681² = 1979297220519522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31458689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1747696 + ... + 1747713.

Almost surely, 2^31458681 is an apocalyptic number.

It is an amenable number.

31458681 is a deficient number, since it is larger than the sum of its proper divisors (13981649).

31458681 is a wasteful number, since it uses less digits than its factorization.

31458681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495415 (or 3495412 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 31458681 is about 5608.8038831822. The cubic root of 31458681 is about 315.6798318096.

The spelling of 31458681 in words is "thirty-one million, four hundred fifty-eight thousand, six hundred eighty-one".