189954917 has 2 divisors, whose sum is σ = 189954918. Its totient is φ = 189954916.

The previous prime is 189954883. The next prime is 189954937. The reversal of 189954917 is 719459981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173422561 + 16532356 = 13169^2 + 4066^2 .

It is an emirp because it is prime and its reverse (719459981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189954917 - 2¹² = 189950821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189954937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94977458 + 94977459.

It is an arithmetic number, because the mean of its divisors is an integer number (94977459).

Almost surely, 2^189954917 is an apocalyptic number.

It is an amenable number.

189954917 is a deficient number, since it is larger than the sum of its proper divisors (1).

189954917 is an equidigital number, since it uses as much as digits as its factorization.

189954917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 53.

The square root of 189954917 is about 13782.4133227820. The cubic root of 189954917 is about 574.8442345561.

The spelling of 189954917 in words is "one hundred eighty-nine million, nine hundred fifty-four thousand, nine hundred seventeen".