31128991529349 has 16 divisors (see below), whose sum is σ = 47451129937920. Its totient is φ = 17781816592560.

The previous prime is 31128991529341. The next prime is 31128991529411. The reversal of 31128991529349 is 94392519982113.

It is not a de Polignac number, because 31128991529349 - 2³ = 31128991529341 is a prime.

It is a super-2 number, since 2×31128991529349² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31128991529349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31128991529341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257378397 + ... + 257499314.

It is an arithmetic number, because the mean of its divisors is an integer number (2965695621120).

Almost surely, 2^{31128991529349} is an apocalyptic number.

It is an amenable number.

31128991529349 is a deficient number, since it is larger than the sum of its proper divisors (16322138408571).

31128991529349 is a wasteful number, since it uses less digits than its factorization.

31128991529349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514880600.

The product of its digits is 37791360, while the sum is 66.

The spelling of 31128991529349 in words is "thirty-one trillion, one hundred twenty-eight billion, nine hundred ninety-one million, five hundred twenty-nine thousand, three hundred forty-nine".