189621926919 has 24 divisors (see below), whose sum is σ = 278571544784. Its totient is φ = 124260480000.

The previous prime is 189621926909. The next prime is 189621926929. The reversal of 189621926919 is 919629126981.

It is an interprime number because it is at equal distance from previous prime (189621926909) and next prime (189621926929).

It is a de Polignac number, because none of the positive numbers 2^k-189621926919 is a prime.

It is a super-2 number, since 2×189621926919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189621926909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 727719 + ... + 953319.

Almost surely, 2^189621926919 is an apocalyptic number.

189621926919 is a deficient number, since it is larger than the sum of its proper divisors (88949617865).

189621926919 is a wasteful number, since it uses less digits than its factorization.

189621926919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227199 (or 227196 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 63.

The spelling of 189621926919 in words is "one hundred eighty-nine billion, six hundred twenty-one million, nine hundred twenty-six thousand, nine hundred nineteen".