1081291657 has 2 divisors, whose sum is σ = 1081291658. Its totient is φ = 1081291656.

The previous prime is 1081291649. The next prime is 1081291661. The reversal of 1081291657 is 7561921801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 987279241 + 94012416 = 31421^2 + 9696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081291657 - 2³ = 1081291649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081291667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540645828 + 540645829.

It is an arithmetic number, because the mean of its divisors is an integer number (540645829).

Almost surely, 2^1081291657 is an apocalyptic number.

It is an amenable number.

1081291657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081291657 is an equidigital number, since it uses as much as digits as its factorization.

1081291657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1081291657 is about 32882.9995134264. Note that the first 3 decimals coincide. The cubic root of 1081291657 is about 1026.3944240182.

The spelling of 1081291657 in words is "one billion, eighty-one million, two hundred ninety-one thousand, six hundred fifty-seven".