189494632381 has 2 divisors, whose sum is σ = 189494632382. Its totient is φ = 189494632380.

The previous prime is 189494632351. The next prime is 189494632409. The reversal of 189494632381 is 183236494981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150105879225 + 39388753156 = 387435^2 + 198466^2 .

It is a cyclic number.

It is not a de Polignac number, because 189494632381 - 2¹⁷ = 189494501309 is a prime.

It is a super-2 number, since 2×189494632381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189494632321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94747316190 + 94747316191.

It is an arithmetic number, because the mean of its divisors is an integer number (94747316191).

Almost surely, 2^189494632381 is an apocalyptic number.

It is an amenable number.

189494632381 is a deficient number, since it is larger than the sum of its proper divisors (1).

189494632381 is an equidigital number, since it uses as much as digits as its factorization.

189494632381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 58.

The spelling of 189494632381 in words is "one hundred eighty-nine billion, four hundred ninety-four million, six hundred thirty-two thousand, three hundred eighty-one".