1027561797 has 24 divisors (see below), whose sum is σ = 1513075928. Its totient is φ = 671846400.

The previous prime is 1027561793. The next prime is 1027561813. The reversal of 1027561797 is 7971657201.

1027561797 is a `hidden beast` number, since 1 + 0 + 27 + 5 + 617 + 9 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 49999041 + 977562756 = 7071^2 + 31266^2 .

It is not a de Polignac number, because 1027561797 - 2² = 1027561793 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1027561793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114597 + ... + 123237.

Almost surely, 2^1027561797 is an apocalyptic number.

It is an amenable number.

1027561797 is a deficient number, since it is larger than the sum of its proper divisors (485514131).

1027561797 is a wasteful number, since it uses less digits than its factorization.

1027561797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901 (or 8898 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

The square root of 1027561797 is about 32055.6047673414. The cubic root of 1027561797 is about 1009.1041289700.

The spelling of 1027561797 in words is "one billion, twenty-seven million, five hundred sixty-one thousand, seven hundred ninety-seven".