1400881591 has 2 divisors, whose sum is σ = 1400881592. Its totient is φ = 1400881590.

The previous prime is 1400881589. The next prime is 1400881597. The reversal of 1400881591 is 1951880041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1400881591 - 2¹ = 1400881589 is a prime.

Together with 1400881589, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1400881591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400881597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700440795 + 700440796.

It is an arithmetic number, because the mean of its divisors is an integer number (700440796).

Almost surely, 2^1400881591 is an apocalyptic number.

1400881591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400881591 is an equidigital number, since it uses as much as digits as its factorization.

1400881591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1400881591 is about 37428.3527689905. The cubic root of 1400881591 is about 1118.9237085490.

The spelling of 1400881591 in words is "one billion, four hundred million, eight hundred eighty-one thousand, five hundred ninety-one".