189512749 has 2 divisors, whose sum is σ = 189512750. Its totient is φ = 189512748.

The previous prime is 189512699. The next prime is 189512761. The reversal of 189512749 is 947215981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139358025 + 50154724 = 11805^2 + 7082^2 .

It is a cyclic number.

It is not a de Polignac number, because 189512749 - 2¹⁵ = 189479981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189512699 and 189512708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189510749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94756374 + 94756375.

It is an arithmetic number, because the mean of its divisors is an integer number (94756375).

Almost surely, 2^189512749 is an apocalyptic number.

It is an amenable number.

189512749 is a deficient number, since it is larger than the sum of its proper divisors (1).

189512749 is an equidigital number, since it uses as much as digits as its factorization.

189512749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 189512749 is about 13766.3629546805. The cubic root of 189512749 is about 574.3978563559.

The spelling of 189512749 in words is "one hundred eighty-nine million, five hundred twelve thousand, seven hundred forty-nine".