31440214031 has 4 divisors (see below), whose sum is σ = 31461588864. Its totient is φ = 31418839200.

The previous prime is 31440213979. The next prime is 31440214037. The reversal of 31440214031 is 13041204413.

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-31440214031 is a prime.

It is a super-2 number, since 2×31440214031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31440213988 and 31440214006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440214037) 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, 10685210 + ... + 10688151.

It is an arithmetic number, because the mean of its divisors is an integer number (7865397216).

Almost surely, 2^31440214031 is an apocalyptic number.

31440214031 is a deficient number, since it is larger than the sum of its proper divisors (21374833).

31440214031 is a wasteful number, since it uses less digits than its factorization.

31440214031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21374832.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31440214031 its reverse (13041204413), we get a palindrome (44481418444).

The spelling of 31440214031 in words is "thirty-one billion, four hundred forty million, two hundred fourteen thousand, thirty-one".