194989045251 has 256 divisors, whose sum is σ = 376543641600. Its totient is φ = 86416243200.

The previous prime is 194989045177. The next prime is 194989045267. The reversal of 194989045251 is 152540989491.

It is not a de Polignac number, because 194989045251 - 2⁹ = 194989044739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 194989045191 and 194989045200.

It is not an unprimeable number, because it can be changed into a prime (194989045451) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 514482780 + ... + 514483158.

It is an arithmetic number, because the mean of its divisors is an integer number (1470873600).

Almost surely, 2^194989045251 is an apocalyptic number.

194989045251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194989045251 is a deficient number, since it is larger than the sum of its proper divisors (181554596349).

194989045251 is a wasteful number, since it uses less digits than its factorization.

194989045251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 194989045251 in words is "one hundred ninety-four billion, nine hundred eighty-nine million, forty-five thousand, two hundred fifty-one".