31019999999 has 4 divisors (see below), whose sum is σ = 31030217064. Its totient is φ = 31009782936.

The previous prime is 31019999993. The next prime is 31020000041. The reversal of 31019999999 is 99999991013.

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 31019999999 - 2³² = 26725032703 is a prime.

It is a Duffinian number.

31019999999 is a modest number, since divided by 999999 gives 31019 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31019999993) 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, 5103977 + ... + 5110050.

It is an arithmetic number, because the mean of its divisors is an integer number (7757554266).

Almost surely, 2^31019999999 is an apocalyptic number.

31019999999 is a deficient number, since it is larger than the sum of its proper divisors (10217065).

31019999999 is a wasteful number, since it uses less digits than its factorization.

31019999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217064.

The product of its (nonzero) digits is 14348907, while the sum is 68.

The spelling of 31019999999 in words is "thirty-one billion, nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".