1251320463 has 6 divisors (see below), whose sum is σ = 1807462904. Its totient is φ = 834213636.

The previous prime is 1251320453. The next prime is 1251320491. The reversal of 1251320463 is 3640231521.

It is not a de Polignac number, because 1251320463 - 2¹⁴ = 1251304079 is a prime.

It is a super-2 number, since 2×1251320463² = 3131605802245068738, 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 (1251320453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69517795 + ... + 69517812.

Almost surely, 2^1251320463 is an apocalyptic number.

1251320463 is a deficient number, since it is larger than the sum of its proper divisors (556142441).

1251320463 is a wasteful number, since it uses less digits than its factorization.

1251320463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139035613 (or 139035610 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1251320463 is about 35374.0082970534. The cubic root of 1251320463 is about 1077.5965250350.

Adding to 1251320463 its reverse (3640231521), we get a palindrome (4891551984).

The spelling of 1251320463 in words is "one billion, two hundred fifty-one million, three hundred twenty thousand, four hundred sixty-three".