1974149251589 has 2 divisors, whose sum is σ = 1974149251590. Its totient is φ = 1974149251588.

The previous prime is 1974149251559. The next prime is 1974149251597. The reversal of 1974149251589 is 9851529414791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1706767183489 + 267382068100 = 1306433^2 + 517090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1974149251589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974149251559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987074625794 + 987074625795.

It is an arithmetic number, because the mean of its divisors is an integer number (987074625795).

Almost surely, 2^{1974149251589} is an apocalyptic number.

It is an amenable number.

1974149251589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974149251589 is an equidigital number, since it uses as much as digits as its factorization.

1974149251589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 65.

The spelling of 1974149251589 in words is "one trillion, nine hundred seventy-four billion, one hundred forty-nine million, two hundred fifty-one thousand, five hundred eighty-nine".