1251253549 has 16 divisors (see below), whose sum is σ = 1555263360. Its totient is φ = 980193600.

The previous prime is 1251253541. The next prime is 1251253559. The reversal of 1251253549 is 9453521521.

It is a cyclic number.

It is not a de Polignac number, because 1251253549 - 2³ = 1251253541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251253541) 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, 58879 + ... + 77260.

It is an arithmetic number, because the mean of its divisors is an integer number (97203960).

Almost surely, 2^1251253549 is an apocalyptic number.

It is an amenable number.

1251253549 is a deficient number, since it is larger than the sum of its proper divisors (304009811).

1251253549 is a wasteful number, since it uses less digits than its factorization.

1251253549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136260.

The product of its digits is 54000, while the sum is 37.

The square root of 1251253549 is about 35373.0624769753. The cubic root of 1251253549 is about 1077.5773166384.

The spelling of 1251253549 in words is "one billion, two hundred fifty-one million, two hundred fifty-three thousand, five hundred forty-nine".