31314015781 has 16 divisors (see below), whose sum is σ = 33246943488. Its totient is φ = 29429769600.

The previous prime is 31314015779. The next prime is 31314015791. The reversal of 31314015781 is 18751041313.

It is a happy number.

It is not a de Polignac number, because 31314015781 - 2¹ = 31314015779 is a prime.

It is a super-2 number, since 2×31314015781² (a number of 22 digits) 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 (31314015751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345161 + ... + 1368241.

It is an arithmetic number, because the mean of its divisors is an integer number (2077933968).

Almost surely, 2^31314015781 is an apocalyptic number.

It is an amenable number.

31314015781 is a deficient number, since it is larger than the sum of its proper divisors (1932927707).

31314015781 is a wasteful number, since it uses less digits than its factorization.

31314015781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24132.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 31314015781 in words is "thirty-one billion, three hundred fourteen million, fifteen thousand, seven hundred eighty-one".