1953121117 has 8 divisors (see below), whose sum is σ = 2024498432. Its totient is φ = 1882267200.

The previous prime is 1953121111. The next prime is 1953121151. The reversal of 1953121117 is 7111213591.

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 1953121117 - 2²³ = 1944732509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953121111) 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, 123243 + ... + 138184.

It is an arithmetic number, because the mean of its divisors is an integer number (253062304).

Almost surely, 2^1953121117 is an apocalyptic number.

It is an amenable number.

1953121117 is a deficient number, since it is larger than the sum of its proper divisors (71377315).

1953121117 is a wasteful number, since it uses less digits than its factorization.

1953121117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261699.

The product of its digits is 1890, while the sum is 31.

The square root of 1953121117 is about 44194.1298930073. The cubic root of 1953121117 is about 1249.9991716261. Note that the first 3 decimals are identical.

The spelling of 1953121117 in words is "one billion, nine hundred fifty-three million, one hundred twenty-one thousand, one hundred seventeen".