1427644991 has 2 divisors, whose sum is σ = 1427644992. Its totient is φ = 1427644990.

The previous prime is 1427644987. The next prime is 1427645027. The reversal of 1427644991 is 1994467241.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1427644991 - 2² = 1427644987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427644931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713822495 + 713822496.

It is an arithmetic number, because the mean of its divisors is an integer number (713822496).

Almost surely, 2^1427644991 is an apocalyptic number.

1427644991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427644991 is an equidigital number, since it uses as much as digits as its factorization.

1427644991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 1427644991 is about 37784.1896962208. The cubic root of 1427644991 is about 1126.0043681810.

The spelling of 1427644991 in words is "one billion, four hundred twenty-seven million, six hundred forty-four thousand, nine hundred ninety-one".