31311252043 has 4 divisors (see below), whose sum is σ = 31413243400. Its totient is φ = 31209260688.

The previous prime is 31311252023. The next prime is 31311252127. The reversal of 31311252043 is 34025211313.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31311252043 - 2¹³ = 31311243851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311251999 and 31311252017.

It is not an unprimeable number, because it can be changed into a prime (31311252023) 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, 50995218 + ... + 50995831.

It is an arithmetic number, because the mean of its divisors is an integer number (7853310850).

Almost surely, 2^31311252043 is an apocalyptic number.

31311252043 is a deficient number, since it is larger than the sum of its proper divisors (101991357).

31311252043 is a wasteful number, since it uses less digits than its factorization.

31311252043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101991356.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 31311252043 its reverse (34025211313), we get a palindrome (65336463356).

The spelling of 31311252043 in words is "thirty-one billion, three hundred eleven million, two hundred fifty-two thousand, forty-three".