1631481 has 4 divisors (see below), whose sum is σ = 2175312. Its totient is φ = 1087652.

The previous prime is 1631471. The next prime is 1631489. The reversal of 1631481 is 1841361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1631481 - 2¹⁰ = 1630457 is a prime.

It is a super-2 number, since 2×1631481² = 5323460506722, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1631489) 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, 271911 + ... + 271916.

It is an arithmetic number, because the mean of its divisors is an integer number (543828).

2^1631481 is an apocalyptic number.

It is an amenable number.

1631481 is a deficient number, since it is larger than the sum of its proper divisors (543831).

1631481 is an equidigital number, since it uses as much as digits as its factorization.

1631481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543830.

The product of its digits is 576, while the sum is 24.

The square root of 1631481 is about 1277.2944061570. The cubic root of 1631481 is about 117.7228244948.

It can be divided in two parts, 1631 and 481, that added together give a palindrome (2112).

The spelling of 1631481 in words is "one million, six hundred thirty-one thousand, four hundred eighty-one".