1667381431 has 8 divisors (see below), whose sum is σ = 1744758144. Its totient is φ = 1591705440.

The previous prime is 1667381413. The next prime is 1667381449. The reversal of 1667381431 is 1341837661.

It is an interprime number because it is at equal distance from previous prime (1667381413) and next prime (1667381449).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1667381431 - 2⁹ = 1667380919 is a prime.

It is a super-2 number, since 2×1667381431² = 5560321672887215522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667381491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423175 + ... + 427096.

It is an arithmetic number, because the mean of its divisors is an integer number (218094768).

Almost surely, 2^1667381431 is an apocalyptic number.

1667381431 is a deficient number, since it is larger than the sum of its proper divisors (77376713).

1667381431 is an equidigital number, since it uses as much as digits as its factorization.

1667381431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850361.

The product of its digits is 72576, while the sum is 40.

The square root of 1667381431 is about 40833.5821475413. The cubic root of 1667381431 is about 1185.8005666382.

The spelling of 1667381431 in words is "one billion, six hundred sixty-seven million, three hundred eighty-one thousand, four hundred thirty-one".