1897117137 has 24 divisors (see below), whose sum is σ = 2835056640. Its totient is φ = 1221186240.

The previous prime is 1897117133. The next prime is 1897117151. The reversal of 1897117137 is 7317117981.

It is not a de Polignac number, because 1897117137 - 2² = 1897117133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1897117092 and 1897117101.

It is not an unprimeable number, because it can be changed into a prime (1897117133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120064 + ... + 134942.

It is an arithmetic number, because the mean of its divisors is an integer number (118127360).

Almost surely, 2^1897117137 is an apocalyptic number.

It is an amenable number.

1897117137 is a deficient number, since it is larger than the sum of its proper divisors (937939503).

1897117137 is a wasteful number, since it uses less digits than its factorization.

1897117137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15373 (or 15370 counting only the distinct ones).

The product of its digits is 74088, while the sum is 45.

The square root of 1897117137 is about 43555.9081755851. The cubic root of 1897117137 is about 1237.9355905204.

The spelling of 1897117137 in words is "one billion, eight hundred ninety-seven million, one hundred seventeen thousand, one hundred thirty-seven".