1989152279 has 2 divisors, whose sum is σ = 1989152280. Its totient is φ = 1989152278.

The previous prime is 1989152257. The next prime is 1989152287. The reversal of 1989152279 is 9722519891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1989152279 - 2²⁴ = 1972375063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989152279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989152219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994576139 + 994576140.

It is an arithmetic number, because the mean of its divisors is an integer number (994576140).

Almost surely, 2^1989152279 is an apocalyptic number.

1989152279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989152279 is an equidigital number, since it uses as much as digits as its factorization.

1989152279 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 1989152279 is about 44599.9134416200. The cubic root of 1989152279 is about 1257.6390404697.

The spelling of 1989152279 in words is "one billion, nine hundred eighty-nine million, one hundred fifty-two thousand, two hundred seventy-nine".