1248291881 has 4 divisors (see below), whose sum is σ = 1271844612. Its totient is φ = 1224739152.

The previous prime is 1248291833. The next prime is 1248291883. The reversal of 1248291881 is 1881928421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 395651881 + 852640000 = 19891^2 + 29200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248291881 is a prime.

It is a super-2 number, since 2×1248291881² = 3116465240341036322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1248291883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11776286 + ... + 11776391.

It is an arithmetic number, because the mean of its divisors is an integer number (317961153).

Almost surely, 2^1248291881 is an apocalyptic number.

It is an amenable number.

1248291881 is a deficient number, since it is larger than the sum of its proper divisors (23552731).

1248291881 is an equidigital number, since it uses as much as digits as its factorization.

1248291881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23552730.

The product of its digits is 73728, while the sum is 44.

The square root of 1248291881 is about 35331.1743507062. The cubic root of 1248291881 is about 1076.7264505693.

The spelling of 1248291881 in words is "one billion, two hundred forty-eight million, two hundred ninety-one thousand, eight hundred eighty-one".