31049947887 has 32 divisors (see below), whose sum is σ = 47678184960. Its totient is φ = 17606799360.

The previous prime is 31049947847. The next prime is 31049947889. The reversal of 31049947887 is 78874994013.

It is not a de Polignac number, because 31049947887 - 2¹⁹ = 31049423599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31049947887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31049947889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1648312 + ... + 1667042.

It is an arithmetic number, because the mean of its divisors is an integer number (1489943280).

Almost surely, 2^31049947887 is an apocalyptic number.

31049947887 is a deficient number, since it is larger than the sum of its proper divisors (16628237073).

31049947887 is a wasteful number, since it uses less digits than its factorization.

31049947887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19343.

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 31049947887 in words is "thirty-one billion, forty-nine million, nine hundred forty-seven thousand, eight hundred eighty-seven".