1405642291 has 2 divisors, whose sum is σ = 1405642292. Its totient is φ = 1405642290.

The previous prime is 1405642289. The next prime is 1405642313. The reversal of 1405642291 is 1922465041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1405642291 - 2¹ = 1405642289 is a prime.

Together with 1405642289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1405642261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702821145 + 702821146.

It is an arithmetic number, because the mean of its divisors is an integer number (702821146).

Almost surely, 2^1405642291 is an apocalyptic number.

1405642291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405642291 is an equidigital number, since it uses as much as digits as its factorization.

1405642291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1405642291 is about 37491.8963377421. The cubic root of 1405642291 is about 1120.1897773122.

The spelling of 1405642291 in words is "one billion, four hundred five million, six hundred forty-two thousand, two hundred ninety-one".