1254665249 has 16 divisors (see below), whose sum is σ = 1331966592. Its totient is φ = 1179349248.

The previous prime is 1254665239. The next prime is 1254665257. The reversal of 1254665249 is 9425664521.

It is a cyclic number.

It is not a de Polignac number, because 1254665249 - 2⁴ = 1254665233 is a prime.

It is a super-4 number, since 4×1254665249⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1254665219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 913127 + ... + 914499.

It is an arithmetic number, because the mean of its divisors is an integer number (83247912).

Almost surely, 2^1254665249 is an apocalyptic number.

It is an amenable number.

1254665249 is a deficient number, since it is larger than the sum of its proper divisors (77301343).

1254665249 is a wasteful number, since it uses less digits than its factorization.

1254665249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056.

The product of its digits is 518400, while the sum is 44.

The square root of 1254665249 is about 35421.2541985741. The cubic root of 1254665249 is about 1078.5558111581. Note that the first 3 decimals are identical.

The spelling of 1254665249 in words is "one billion, two hundred fifty-four million, six hundred sixty-five thousand, two hundred forty-nine".