31897628849 has 8 divisors (see below), whose sum is σ = 34483923840. Its totient is φ = 29402081136.

The previous prime is 31897628837. The next prime is 31897628863. The reversal of 31897628849 is 94882679813.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31897628849 - 2²⁰ = 31896580273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31897628899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22686089 + ... + 22687494.

It is an arithmetic number, because the mean of its divisors is an integer number (4310490480).

Almost surely, 2^31897628849 is an apocalyptic number.

It is an amenable number.

31897628849 is a deficient number, since it is larger than the sum of its proper divisors (2586294991).

31897628849 is a wasteful number, since it uses less digits than its factorization.

31897628849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45373639.

The product of its digits is 41803776, while the sum is 65.

The spelling of 31897628849 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred twenty-eight thousand, eight hundred forty-nine".