194375631257 has 4 divisors (see below), whose sum is σ = 194396556900. Its totient is φ = 194354705616.

The previous prime is 194375631209. The next prime is 194375631259. The reversal of 194375631257 is 752136573491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752136573491 = 131 ⋅5741500561.

It can be written as a sum of positive squares in 2 ways, for example, as 4677055321 + 189698575936 = 68389^2 + 435544^2 .

It is a cyclic number.

It is not a de Polignac number, because 194375631257 - 2²⁸ = 194107195801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194375631199 and 194375631208.

It is not an unprimeable number, because it can be changed into a prime (194375631259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10448882 + ... + 10467467.

It is an arithmetic number, because the mean of its divisors is an integer number (48599139225).

Almost surely, 2^194375631257 is an apocalyptic number.

It is an amenable number.

194375631257 is a deficient number, since it is larger than the sum of its proper divisors (20925643).

194375631257 is an equidigital number, since it uses as much as digits as its factorization.

194375631257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20925642.

The product of its digits is 4762800, while the sum is 53.

The spelling of 194375631257 in words is "one hundred ninety-four billion, three hundred seventy-five million, six hundred thirty-one thousand, two hundred fifty-seven".