1253489491 has 2 divisors, whose sum is σ = 1253489492. Its totient is φ = 1253489490.

The previous prime is 1253489459. The next prime is 1253489507. The reversal of 1253489491 is 1949843521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1253489491 - 2⁵ = 1253489459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253489401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626744745 + 626744746.

It is an arithmetic number, because the mean of its divisors is an integer number (626744746).

Almost surely, 2^1253489491 is an apocalyptic number.

1253489491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253489491 is an equidigital number, since it uses as much as digits as its factorization.

1253489491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 1253489491 is about 35404.6535218183. The cubic root of 1253489491 is about 1078.2187977719.

The spelling of 1253489491 in words is "one billion, two hundred fifty-three million, four hundred eighty-nine thousand, four hundred ninety-one".