1240151491 has 2 divisors, whose sum is σ = 1240151492. Its totient is φ = 1240151490.

The previous prime is 1240151461. The next prime is 1240151501. The reversal of 1240151491 is 1941510421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240151491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240151461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620075745 + 620075746.

It is an arithmetic number, because the mean of its divisors is an integer number (620075746).

Almost surely, 2^1240151491 is an apocalyptic number.

1240151491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240151491 is an equidigital number, since it uses as much as digits as its factorization.

1240151491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1240151491 is about 35215.7846852800. The cubic root of 1240151491 is about 1074.3808198518.

The spelling of 1240151491 in words is "one billion, two hundred forty million, one hundred fifty-one thousand, four hundred ninety-one".