1253788997 has 2 divisors, whose sum is σ = 1253788998. Its totient is φ = 1253788996.

The previous prime is 1253788973. The next prime is 1253789011. The reversal of 1253788997 is 7998873521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164788641 + 89000356 = 34129^2 + 9434^2 .

It is an emirp because it is prime and its reverse (7998873521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1253788997 - 2²² = 1249594693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253788297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626894498 + 626894499.

It is an arithmetic number, because the mean of its divisors is an integer number (626894499).

Almost surely, 2^1253788997 is an apocalyptic number.

It is an amenable number.

1253788997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253788997 is an equidigital number, since it uses as much as digits as its factorization.

1253788997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 1253788997 is about 35408.8830238967. The cubic root of 1253788997 is about 1078.3046666696.

The spelling of 1253788997 in words is "one billion, two hundred fifty-three million, seven hundred eighty-eight thousand, nine hundred ninety-seven".