1631489 has 2 divisors, whose sum is σ = 1631490. Its totient is φ = 1631488.

The previous prime is 1631471. The next prime is 1631491. The reversal of 1631489 is 9841361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1459264 + 172225 = 1208^2 + 415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631489 is a prime.

Together with 1631491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1631989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815744 + 815745.

It is an arithmetic number, because the mean of its divisors is an integer number (815745).

2^1631489 is an apocalyptic number.

It is an amenable number.

1631489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631489 is an equidigital number, since it uses as much as digits as its factorization.

1631489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 1631489 is about 1277.2975377726. The cubic root of 1631489 is about 117.7230169133.

The spelling of 1631489 in words is "one million, six hundred thirty-one thousand, four hundred eighty-nine".