381251900691 has 6 divisors (see below), whose sum is σ = 550697189900. Its totient is φ = 254167933788.

The previous prime is 381251900629. The next prime is 381251900707. The reversal of 381251900691 is 196009152183.

381251900691 is a `hidden beast` number, since 38 + 12 + 519 + 0 + 0 + 6 + 91 = 666.

It is not a de Polignac number, because 381251900691 - 2¹³ = 381251892499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381251500691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21180661141 + ... + 21180661158.

Almost surely, 2^381251900691 is an apocalyptic number.

381251900691 is a deficient number, since it is larger than the sum of its proper divisors (169445289209).

381251900691 is a wasteful number, since it uses less digits than its factorization.

381251900691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42361322305 (or 42361322302 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 381251900691 in words is "three hundred eighty-one billion, two hundred fifty-one million, nine hundred thousand, six hundred ninety-one".