1254515649 has 4 divisors (see below), whose sum is σ = 1672687536. Its totient is φ = 836343764.

The previous prime is 1254515623. The next prime is 1254515651. The reversal of 1254515649 is 9465154521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1254515649 - 2²⁰ = 1253467073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1254515649.

It is not an unprimeable number, because it can be changed into a prime (1254514649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209085939 + ... + 209085944.

It is an arithmetic number, because the mean of its divisors is an integer number (418171884).

Almost surely, 2^1254515649 is an apocalyptic number.

It is an amenable number.

1254515649 is a deficient number, since it is larger than the sum of its proper divisors (418171887).

1254515649 is an equidigital number, since it uses as much as digits as its factorization.

1254515649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418171886.

The product of its digits is 216000, while the sum is 42.

The square root of 1254515649 is about 35419.1424091550. The cubic root of 1254515649 is about 1078.5129422566.

The spelling of 1254515649 in words is "one billion, two hundred fifty-four million, five hundred fifteen thousand, six hundred forty-nine".