1081236491 has 2 divisors, whose sum is σ = 1081236492. Its totient is φ = 1081236490.

The previous prime is 1081236449. The next prime is 1081236521. The reversal of 1081236491 is 1946321801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1081236491 - 2⁶ = 1081236427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081236421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540618245 + 540618246.

It is an arithmetic number, because the mean of its divisors is an integer number (540618246).

Almost surely, 2^1081236491 is an apocalyptic number.

1081236491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081236491 is an equidigital number, since it uses as much as digits as its factorization.

1081236491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1081236491 is about 32882.1606802229. The cubic root of 1081236491 is about 1026.3769686482.

The spelling of 1081236491 in words is "one billion, eighty-one million, two hundred thirty-six thousand, four hundred ninety-one".