1631242 has 4 divisors (see below), whose sum is σ = 2446866. Its totient is φ = 815620.

The previous prime is 1631209. The next prime is 1631243. The reversal of 1631242 is 2421361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2421361 = 17 ⋅142433.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 505521 = 1061^2 + 711^2 .

It is not an unprimeable number, because it can be changed into a prime (1631243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407809 + ... + 407812.

2^1631242 is an apocalyptic number.

1631242 is a deficient number, since it is larger than the sum of its proper divisors (815624).

1631242 is an equidigital number, since it uses as much as digits as its factorization.

1631242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815623.

The product of its digits is 288, while the sum is 19.

The square root of 1631242 is about 1277.2008455995. The cubic root of 1631242 is about 117.7170757040.

The spelling of 1631242 in words is "one million, six hundred thirty-one thousand, two hundred forty-two".