31287264949 has 4 divisors (see below), whose sum is σ = 31287631936. Its totient is φ = 31286897964.

The previous prime is 31287264893. The next prime is 31287264971. The reversal of 31287264949 is 94946278213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31287264949 - 2¹¹ = 31287262901 is a prime.

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 31287264949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31287262949) 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, 18532 + ... + 250834.

It is an arithmetic number, because the mean of its divisors is an integer number (7821907984).

Almost surely, 2^31287264949 is an apocalyptic number.

It is an amenable number.

31287264949 is a deficient number, since it is larger than the sum of its proper divisors (366987).

31287264949 is a wasteful number, since it uses less digits than its factorization.

31287264949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366986.

The product of its digits is 5225472, while the sum is 55.

It can be divided in two parts, 31287264 and 949, that added together give a palindrome (31288213).

The spelling of 31287264949 in words is "thirty-one billion, two hundred eighty-seven million, two hundred sixty-four thousand, nine hundred forty-nine".