31400311403231 has 4 divisors (see below), whose sum is σ = 31516179711264. Its totient is φ = 31284443095200.

The previous prime is 31400311403203. The next prime is 31400311403233. The reversal of 31400311403231 is 13230411300413.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31400311403231 is a prime.

It is a super-2 number, since 2×31400311403231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31400311403231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400311403233) 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, 57934153610 + ... + 57934154151.

It is an arithmetic number, because the mean of its divisors is an integer number (7879044927816).

Almost surely, 2^{31400311403231} is an apocalyptic number.

31400311403231 is a deficient number, since it is larger than the sum of its proper divisors (115868308033).

31400311403231 is a wasteful number, since it uses less digits than its factorization.

31400311403231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115868308032.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31400311403231 its reverse (13230411300413), we get a palindrome (44630722703644).

The spelling of 31400311403231 in words is "thirty-one trillion, four hundred billion, three hundred eleven million, four hundred three thousand, two hundred thirty-one".