1291401248 has 12 divisors (see below), whose sum is σ = 2542446270. Its totient is φ = 645700608.

The previous prime is 1291401247. The next prime is 1291401259. The reversal of 1291401248 is 8421041921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1093492624 + 197908624 = 33068^2 + 14068^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 40356289 = 1291401248 / (1 + 2 + 9 + 1 + 4 + 0 + 1 + 2 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (1291401247) 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 as a sum of consecutive naturals, namely, 20178113 + ... + 20178176.

Almost surely, 2^1291401248 is an apocalyptic number.

It is an amenable number.

1291401248 is a deficient number, since it is larger than the sum of its proper divisors (1251045022).

1291401248 is an equidigital number, since it uses as much as digits as its factorization.

1291401248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40356299 (or 40356291 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1291401248 is about 35936.0716829205. The cubic root of 1291401248 is about 1088.9812460389.

The spelling of 1291401248 in words is "one billion, two hundred ninety-one million, four hundred one thousand, two hundred forty-eight".