1356042491 has 2 divisors, whose sum is σ = 1356042492. Its totient is φ = 1356042490.

The previous prime is 1356042481. The next prime is 1356042497. The reversal of 1356042491 is 1942406531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1356042491 - 2⁶ = 1356042427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1356042497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678021245 + 678021246.

It is an arithmetic number, because the mean of its divisors is an integer number (678021246).

Almost surely, 2^1356042491 is an apocalyptic number.

1356042491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356042491 is an equidigital number, since it uses as much as digits as its factorization.

1356042491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1356042491 is about 36824.4822231080. The cubic root of 1356042491 is about 1106.8559382669.

The spelling of 1356042491 in words is "one billion, three hundred fifty-six million, forty-two thousand, four hundred ninety-one".