1081784657 has 2 divisors, whose sum is σ = 1081784658. Its totient is φ = 1081784656.

The previous prime is 1081784633. The next prime is 1081784663. The reversal of 1081784657 is 7564871801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728946001 + 352838656 = 26999^2 + 18784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081784657 - 2²⁴ = 1065007441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081784677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540892328 + 540892329.

It is an arithmetic number, because the mean of its divisors is an integer number (540892329).

Almost surely, 2^1081784657 is an apocalyptic number.

It is an amenable number.

1081784657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081784657 is an equidigital number, since it uses as much as digits as its factorization.

1081784657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 47.

The square root of 1081784657 is about 32890.4949339471. The cubic root of 1081784657 is about 1026.5503904385.

The spelling of 1081784657 in words is "one billion, eighty-one million, seven hundred eighty-four thousand, six hundred fifty-seven".