189115397 has 2 divisors, whose sum is σ = 189115398. Its totient is φ = 189115396.

The previous prime is 189115391. The next prime is 189115439. The reversal of 189115397 is 793511981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128913316 + 60202081 = 11354^2 + 7759^2 .

It is a cyclic number.

It is not a de Polignac number, because 189115397 - 2¹⁴ = 189099013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189115391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94557698 + 94557699.

It is an arithmetic number, because the mean of its divisors is an integer number (94557699).

Almost surely, 2^189115397 is an apocalyptic number.

It is an amenable number.

189115397 is a deficient number, since it is larger than the sum of its proper divisors (1).

189115397 is an equidigital number, since it uses as much as digits as its factorization.

189115397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 44.

The square root of 189115397 is about 13751.9233927476. The cubic root of 189115397 is about 573.9961281694.

The spelling of 189115397 in words is "one hundred eighty-nine million, one hundred fifteen thousand, three hundred ninety-seven".