31355687139 has 32 divisors (see below), whose sum is σ = 49446858240. Its totient is φ = 17292979200.

The previous prime is 31355687117. The next prime is 31355687147. The reversal of 31355687139 is 93178655313.

It is not a de Polignac number, because 31355687139 - 2¹² = 31355683043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31355687091 and 31355687100.

It is not an unprimeable number, because it can be changed into a prime (31355687039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1843504 + ... + 1860434.

It is an arithmetic number, because the mean of its divisors is an integer number (1545214320).

Almost surely, 2^31355687139 is an apocalyptic number.

31355687139 is a deficient number, since it is larger than the sum of its proper divisors (18091171101).

31355687139 is a wasteful number, since it uses less digits than its factorization.

31355687139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20011.

The product of its digits is 2041200, while the sum is 51.

The spelling of 31355687139 in words is "thirty-one billion, three hundred fifty-five million, six hundred eighty-seven thousand, one hundred thirty-nine".