1253555399 has 2 divisors, whose sum is σ = 1253555400. Its totient is φ = 1253555398.

The previous prime is 1253555357. The next prime is 1253555473. The reversal of 1253555399 is 9935553521.

It is a weak prime.

It is an emirp because it is prime and its reverse (9935553521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253555399 is a prime.

It is a super-2 number, since 2×1253555399² = 3142802276724098402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253555599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626777699 + 626777700.

It is an arithmetic number, because the mean of its divisors is an integer number (626777700).

Almost surely, 2^1253555399 is an apocalyptic number.

1253555399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253555399 is an equidigital number, since it uses as much as digits as its factorization.

1253555399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 911250, while the sum is 47.

The square root of 1253555399 is about 35405.5842911821. The cubic root of 1253555399 is about 1078.2376948853.

The spelling of 1253555399 in words is "one billion, two hundred fifty-three million, five hundred fifty-five thousand, three hundred ninety-nine".