1868684531 has 6 divisors (see below), whose sum is σ = 2173775940. Its totient is φ = 1601729556.

The previous prime is 1868684509. The next prime is 1868684537. The reversal of 1868684531 is 1354868681.

It is not a de Polignac number, because 1868684531 - 2¹⁴ = 1868668147 is a prime.

It is a super-2 number, since 2×1868684531² = 6983963752797379922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1868684531.

It is not an unprimeable number, because it can be changed into a prime (1868684537) 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, 19068161 + ... + 19068258.

It is an arithmetic number, because the mean of its divisors is an integer number (362295990).

Almost surely, 2^1868684531 is an apocalyptic number.

1868684531 is a deficient number, since it is larger than the sum of its proper divisors (305091409).

1868684531 is an equidigital number, since it uses as much as digits as its factorization.

1868684531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38136433 (or 38136426 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 50.

The square root of 1868684531 is about 43228.2839238386. The cubic root of 1868684531 is about 1231.7200099784.

The spelling of 1868684531 in words is "one billion, eight hundred sixty-eight million, six hundred eighty-four thousand, five hundred thirty-one".