1115761897 has 2 divisors, whose sum is σ = 1115761898. Its totient is φ = 1115761896.

The previous prime is 1115761861. The next prime is 1115761937. The reversal of 1115761897 is 7981675111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079713881 + 36048016 = 32859^2 + 6004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115761897 - 2¹¹ = 1115759849 is a prime.

It is a super-2 number, since 2×1115761897² = 2489849221594077218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1115761397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557880948 + 557880949.

It is an arithmetic number, because the mean of its divisors is an integer number (557880949).

Almost surely, 2^1115761897 is an apocalyptic number.

It is an amenable number.

1115761897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115761897 is an equidigital number, since it uses as much as digits as its factorization.

1115761897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 46.

The square root of 1115761897 is about 33403.0222734411. The cubic root of 1115761897 is about 1037.1872643707.

The spelling of 1115761897 in words is "one billion, one hundred fifteen million, seven hundred sixty-one thousand, eight hundred ninety-seven".