1631129 has 4 divisors (see below), whose sum is σ = 1635876. Its totient is φ = 1626384.

The previous prime is 1631117. The next prime is 1631143. The reversal of 1631129 is 9211361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9211361 = 67 ⋅137483.

It can be written as a sum of positive squares in 2 ways, for example, as 912025 + 719104 = 955^2 + 848^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631129 - 2¹² = 1627033 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814 + ... + 2559.

It is an arithmetic number, because the mean of its divisors is an integer number (408969).

2^1631129 is an apocalyptic number.

It is an amenable number.

1631129 is a deficient number, since it is larger than the sum of its proper divisors (4747).

1631129 is an equidigital number, since it uses as much as digits as its factorization.

1631129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746.

The product of its digits is 324, while the sum is 23.

The square root of 1631129 is about 1277.1566074683. The cubic root of 1631129 is about 117.7143574609.

The spelling of 1631129 in words is "one million, six hundred thirty-one thousand, one hundred twenty-nine".