1631816 has 8 divisors (see below), whose sum is σ = 3059670. Its totient is φ = 815904.

The previous prime is 1631797. The next prime is 1631821. The reversal of 1631816 is 6181361.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 729316 = 950^2 + 854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101981 + ... + 101996.

2^1631816 is an apocalyptic number.

It is an amenable number.

1631816 is a deficient number, since it is larger than the sum of its proper divisors (1427854).

1631816 is a wasteful number, since it uses less digits than its factorization.

1631816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203983 (or 203979 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 1631816 is about 1277.4255359903. The cubic root of 1631816 is about 117.7308814785.

It can be divided in two parts, 1631 and 816, that multiplied together give a triangular number (1330896 = T₁₆₃₁).

The spelling of 1631816 in words is "one million, six hundred thirty-one thousand, eight hundred sixteen".