1251348479 has 4 divisors (see below), whose sum is σ = 1255129320. Its totient is φ = 1247567640.

The previous prime is 1251348467. The next prime is 1251348487. The reversal of 1251348479 is 9748431521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9748431521 = 521 ⋅18711001.

It is a cyclic number.

It is not a de Polignac number, because 1251348479 - 2¹² = 1251344383 is a prime.

It is a super-2 number, since 2×1251348479² = 3131746031791226882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251348409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889924 + ... + 1890585.

It is an arithmetic number, because the mean of its divisors is an integer number (313782330).

Almost surely, 2^1251348479 is an apocalyptic number.

1251348479 is a deficient number, since it is larger than the sum of its proper divisors (3780841).

1251348479 is an equidigital number, since it uses as much as digits as its factorization.

1251348479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780840.

The product of its digits is 241920, while the sum is 44.

The square root of 1251348479 is about 35374.4042918040. The cubic root of 1251348479 is about 1077.6045671313.

The spelling of 1251348479 in words is "one billion, two hundred fifty-one million, three hundred forty-eight thousand, four hundred seventy-nine".