1090486781 has 2 divisors, whose sum is σ = 1090486782. Its totient is φ = 1090486780.

The previous prime is 1090486759. The next prime is 1090486807. The reversal of 1090486781 is 1876840901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 909987556 + 180499225 = 30166^2 + 13435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090486781 - 2²² = 1086292477 is a prime.

It is a super-2 number, since 2×1090486781² = 2378322839071483922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1090486381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545243390 + 545243391.

It is an arithmetic number, because the mean of its divisors is an integer number (545243391).

Almost surely, 2^1090486781 is an apocalyptic number.

It is an amenable number.

1090486781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090486781 is an equidigital number, since it uses as much as digits as its factorization.

1090486781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1090486781 is about 33022.5193012284. The cubic root of 1090486781 is about 1029.2956446884.

The spelling of 1090486781 in words is "one billion, ninety million, four hundred eighty-six thousand, seven hundred eighty-one".