1240891471 has 2 divisors, whose sum is σ = 1240891472. Its totient is φ = 1240891470.

The previous prime is 1240891447. The next prime is 1240891493. The reversal of 1240891471 is 1741980421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1741980421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240891471 is a prime.

It is a super-3 number, since 3×1240891471³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1240891471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240891441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620445735 + 620445736.

It is an arithmetic number, because the mean of its divisors is an integer number (620445736).

Almost surely, 2^1240891471 is an apocalyptic number.

1240891471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240891471 is an equidigital number, since it uses as much as digits as its factorization.

1240891471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1240891471 is about 35226.2894866888. The cubic root of 1240891471 is about 1074.5944663973.

The spelling of 1240891471 in words is "one billion, two hundred forty million, eight hundred ninety-one thousand, four hundred seventy-one".