1867121798431 has 2 divisors, whose sum is σ = 1867121798432. Its totient is φ = 1867121798430.

The previous prime is 1867121798393. The next prime is 1867121798483. The reversal of 1867121798431 is 1348971217681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1867121798431 - 2⁷ = 1867121798303 is a prime.

It is a super-2 number, since 2×1867121798431² (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 (1867121798131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933560899215 + 933560899216.

It is an arithmetic number, because the mean of its divisors is an integer number (933560899216).

Almost surely, 2^{1867121798431} is an apocalyptic number.

1867121798431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1867121798431 is an equidigital number, since it uses as much as digits as its factorization.

1867121798431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 58.

The spelling of 1867121798431 in words is "one trillion, eight hundred sixty-seven billion, one hundred twenty-one million, seven hundred ninety-eight thousand, four hundred thirty-one".