1249921459 has 2 divisors, whose sum is σ = 1249921460. Its totient is φ = 1249921458.

The previous prime is 1249921423. The next prime is 1249921469. The reversal of 1249921459 is 9541299421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9541299421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249921459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249921469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624960729 + 624960730.

It is an arithmetic number, because the mean of its divisors is an integer number (624960730).

Almost surely, 2^1249921459 is an apocalyptic number.

1249921459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249921459 is an equidigital number, since it uses as much as digits as its factorization.

1249921459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 1249921459 is about 35354.2283044051. The cubic root of 1249921459 is about 1077.1947830161.

The spelling of 1249921459 in words is "one billion, two hundred forty-nine million, nine hundred twenty-one thousand, four hundred fifty-nine".