1627242391 has 2 divisors, whose sum is σ = 1627242392. Its totient is φ = 1627242390.

The previous prime is 1627242371. The next prime is 1627242427. The reversal of 1627242391 is 1932427261.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1627242391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1627242391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1627242371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813621195 + 813621196.

It is an arithmetic number, because the mean of its divisors is an integer number (813621196).

Almost surely, 2^1627242391 is an apocalyptic number.

1627242391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1627242391 is an equidigital number, since it uses as much as digits as its factorization.

1627242391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 1627242391 is about 40339.0925901910. The cubic root of 1627242391 is about 1176.2078759953.

The spelling of 1627242391 in words is "one billion, six hundred twenty-seven million, two hundred forty-two thousand, three hundred ninety-one".