1055987897 has 4 divisors (see below), whose sum is σ = 1073299236. Its totient is φ = 1038676560.

The previous prime is 1055987831. The next prime is 1055987903. The reversal of 1055987897 is 7987895501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22429696 + 1033558201 = 4736^2 + 32149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055987897 is a prime.

It is a super-2 number, since 2×1055987897² = 2230220877220965218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1055987297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8655578 + ... + 8655699.

It is an arithmetic number, because the mean of its divisors is an integer number (268324809).

Almost surely, 2^1055987897 is an apocalyptic number.

It is an amenable number.

1055987897 is a deficient number, since it is larger than the sum of its proper divisors (17311339).

1055987897 is an equidigital number, since it uses as much as digits as its factorization.

1055987897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17311338.

The product of its (nonzero) digits is 6350400, while the sum is 59.

The square root of 1055987897 is about 32495.9673959708. The cubic root of 1055987897 is about 1018.3247835029.

The spelling of 1055987897 in words is "one billion, fifty-five million, nine hundred eighty-seven thousand, eight hundred ninety-seven".