1861874457431 has 2 divisors, whose sum is σ = 1861874457432. Its totient is φ = 1861874457430.

The previous prime is 1861874457403. The next prime is 1861874457437. The reversal of 1861874457431 is 1347544781681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1861874457431 - 2¹⁴ = 1861874441047 is a prime.

It is a super-2 number, since 2×1861874457431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861874457437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930937228715 + 930937228716.

It is an arithmetic number, because the mean of its divisors is an integer number (930937228716).

Almost surely, 2^{1861874457431} is an apocalyptic number.

1861874457431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861874457431 is an equidigital number, since it uses as much as digits as its factorization.

1861874457431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18063360, while the sum is 59.

The spelling of 1861874457431 in words is "one trillion, eight hundred sixty-one billion, eight hundred seventy-four million, four hundred fifty-seven thousand, four hundred thirty-one".