1491391427 has 2 divisors, whose sum is σ = 1491391428. Its totient is φ = 1491391426.

The previous prime is 1491391411. The next prime is 1491391457. The reversal of 1491391427 is 7241931941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491391427 - 2⁴ = 1491391411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491391457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745695713 + 745695714.

It is an arithmetic number, because the mean of its divisors is an integer number (745695714).

Almost surely, 2^1491391427 is an apocalyptic number.

1491391427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491391427 is an equidigital number, since it uses as much as digits as its factorization.

1491391427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 1491391427 is about 38618.5373493093. The cubic root of 1491391427 is about 1142.5201829976.

The spelling of 1491391427 in words is "one billion, four hundred ninety-one million, three hundred ninety-one thousand, four hundred twenty-seven".