1587497861 has 6 divisors (see below), whose sum is σ = 1675448262. Its totient is φ = 1503945000.

The previous prime is 1587497843. The next prime is 1587497867. The reversal of 1587497861 is 1687947851.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1262380900 + 325116961 = 35530^2 + 18031^2 .

It is not a de Polignac number, because 1587497861 - 2⁶ = 1587497797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1587497797 and 1587497806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587497867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2198390 + ... + 2199111.

It is an arithmetic number, because the mean of its divisors is an integer number (279241377).

Almost surely, 2^1587497861 is an apocalyptic number.

It is an amenable number.

1587497861 is a deficient number, since it is larger than the sum of its proper divisors (87950401).

1587497861 is an equidigital number, since it uses as much as digits as its factorization.

1587497861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397539 (or 4397520 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The square root of 1587497861 is about 39843.4167837047. The cubic root of 1587497861 is about 1166.5527530229.

The spelling of 1587497861 in words is "one billion, five hundred eighty-seven million, four hundred ninety-seven thousand, eight hundred sixty-one".