1868705431 has 2 divisors, whose sum is σ = 1868705432. Its totient is φ = 1868705430.

The previous prime is 1868705411. The next prime is 1868705453. The reversal of 1868705431 is 1345078681.

It is a weak prime.

It is an emirp because it is prime and its reverse (1345078681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868705431 is a prime.

It is a super-2 number, since 2×1868705431² = 6984119975697791522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868705401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934352715 + 934352716.

It is an arithmetic number, because the mean of its divisors is an integer number (934352716).

Almost surely, 2^1868705431 is an apocalyptic number.

1868705431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868705431 is an equidigital number, since it uses as much as digits as its factorization.

1868705431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 1868705431 is about 43228.5256630388. The cubic root of 1868705431 is about 1231.7246019523.

The spelling of 1868705431 in words is "one billion, eight hundred sixty-eight million, seven hundred five thousand, four hundred thirty-one".