1240151291 has 2 divisors, whose sum is σ = 1240151292. Its totient is φ = 1240151290.

The previous prime is 1240151279. The next prime is 1240151323. The reversal of 1240151291 is 1921510421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240151291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240151291.

It is not a weakly prime, because it can be changed into another prime (1240151221) 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 as a sum of consecutive naturals, namely, 620075645 + 620075646.

It is an arithmetic number, because the mean of its divisors is an integer number (620075646).

Almost surely, 2^1240151291 is an apocalyptic number.

1240151291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240151291 is an equidigital number, since it uses as much as digits as its factorization.

1240151291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1240151291 is about 35215.7818456441. The cubic root of 1240151291 is about 1074.3807620965.

The spelling of 1240151291 in words is "one billion, two hundred forty million, one hundred fifty-one thousand, two hundred ninety-one".