189272857 has 2 divisors, whose sum is σ = 189272858. Its totient is φ = 189272856.

The previous prime is 189272791. The next prime is 189272869. The reversal of 189272857 is 758272981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151191616 + 38081241 = 12296^2 + 6171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189272857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189272857.

It is not a weakly prime, because it can be changed into another prime (189272257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94636428 + 94636429.

It is an arithmetic number, because the mean of its divisors is an integer number (94636429).

Almost surely, 2^189272857 is an apocalyptic number.

It is an amenable number.

189272857 is a deficient number, since it is larger than the sum of its proper divisors (1).

189272857 is an equidigital number, since it uses as much as digits as its factorization.

189272857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 49.

The square root of 189272857 is about 13757.6472189107. The cubic root of 189272857 is about 574.1553895852.

The spelling of 189272857 in words is "one hundred eighty-nine million, two hundred seventy-two thousand, eight hundred fifty-seven".