1631667 has 4 divisors (see below), whose sum is σ = 2175560. Its totient is φ = 1087776.

The previous prime is 1631659. The next prime is 1631683. The reversal of 1631667 is 7661361.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1631667 - 2³ = 1631659 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1631647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271942 + ... + 271947.

It is an arithmetic number, because the mean of its divisors is an integer number (543890).

2^1631667 is an apocalyptic number.

1631667 is a deficient number, since it is larger than the sum of its proper divisors (543893).

1631667 is an equidigital number, since it uses as much as digits as its factorization.

1631667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543892.

The product of its digits is 4536, while the sum is 30.

The square root of 1631667 is about 1277.3672142340. The cubic root of 1631667 is about 117.7272980607.

It can be divided in two parts, 163 and 1667, that added together give a triangular number (1830 = T₆₀).

The spelling of 1631667 in words is "one million, six hundred thirty-one thousand, six hundred sixty-seven".