1251226505 has 8 divisors (see below), whose sum is σ = 1502649792. Its totient is φ = 1000195888.

The previous prime is 1251226429. The next prime is 1251226507. The reversal of 1251226505 is 5056221521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251226505 - 2²⁸ = 982791049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251226507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91109 + ... + 103938.

It is an arithmetic number, because the mean of its divisors is an integer number (187831224).

Almost surely, 2^1251226505 is an apocalyptic number.

It is an amenable number.

1251226505 is a deficient number, since it is larger than the sum of its proper divisors (251423287).

1251226505 is a wasteful number, since it uses less digits than its factorization.

1251226505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196335.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1251226505 is about 35372.6802066227. The cubic root of 1251226505 is about 1077.5695531676.

The spelling of 1251226505 in words is "one billion, two hundred fifty-one million, two hundred twenty-six thousand, five hundred five".