1631330 has 16 divisors (see below), whose sum is σ = 3016440. Its totient is φ = 634752.

The previous prime is 1631309. The next prime is 1631341. The reversal of 1631330 is 331361.

It can be written as a sum of positive squares in 4 ways, for example, as 1270129 + 361201 = 1127^2 + 601^2 .

It is a super-2 number, since 2×1631330² = 5322475137800, which contains 22 as substring.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1631299 and 1631308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1835 + ... + 2574.

2^1631330 is an apocalyptic number.

1631330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1631330 is a deficient number, since it is larger than the sum of its proper divisors (1385110).

1631330 is a wasteful number, since it uses less digits than its factorization.

1631330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1631330 is about 1277.2352954722. The cubic root of 1631330 is about 117.7191924789.

Adding to 1631330 its reverse (331361), we get a palindrome (1962691).

The spelling of 1631330 in words is "one million, six hundred thirty-one thousand, three hundred thirty".