1631669 has 8 divisors (see below), whose sum is σ = 1767192. Its totient is φ = 1497600.

The previous prime is 1631659. The next prime is 1631683. The reversal of 1631669 is 9661361.

It can be written as a sum of positive squares in 4 ways, for example, as 56644 + 1575025 = 238^2 + 1255^2 .

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

It is not a de Polignac number, because 1631669 - 2¹² = 1627573 is a prime.

It is a super-2 number, since 2×1631669² = 5324687451122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631629) 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, 3869 + ... + 4269.

It is an arithmetic number, because the mean of its divisors is an integer number (220899).

2^1631669 is an apocalyptic number.

It is an amenable number.

1631669 is a deficient number, since it is larger than the sum of its proper divisors (135523).

1631669 is a wasteful number, since it uses less digits than its factorization.

1631669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727.

The product of its digits is 5832, while the sum is 32.

The square root of 1631669 is about 1277.3679970940. The cubic root of 1631669 is about 117.7273461617.

The spelling of 1631669 in words is "one million, six hundred thirty-one thousand, six hundred sixty-nine".