1249665451 has 2 divisors, whose sum is σ = 1249665452. Its totient is φ = 1249665450.

The previous prime is 1249665437. The next prime is 1249665467. The reversal of 1249665451 is 1545669421.

It is a weak prime.

It is an emirp because it is prime and its reverse (1545669421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1249665451 - 2¹³ = 1249657259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1249665398 and 1249665407.

It is not a weakly prime, because it can be changed into another prime (1249665251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624832725 + 624832726.

It is an arithmetic number, because the mean of its divisors is an integer number (624832726).

Almost surely, 2^1249665451 is an apocalyptic number.

1249665451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249665451 is an equidigital number, since it uses as much as digits as its factorization.

1249665451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The square root of 1249665451 is about 35350.6075053881. The cubic root of 1249665451 is about 1077.1212345783.

The spelling of 1249665451 in words is "one billion, two hundred forty-nine million, six hundred sixty-five thousand, four hundred fifty-one".