1018631 has 4 divisors (see below), whose sum is σ = 1040352. Its totient is φ = 996912.

The previous prime is 1018621. The next prime is 1018643. The reversal of 1018631 is 1368101.

1018631 = 54² + 55² + ... + 147².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1368101 = 7 ⋅195443.

It is a cyclic number.

It is not a de Polignac number, because 1018631 - 2¹⁰ = 1017607 is a prime.

It is a super-2 number, since 2×1018631² = 2075218228322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018621) 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, 10790 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (260088).

2^1018631 is an apocalyptic number.

1018631 is a deficient number, since it is larger than the sum of its proper divisors (21721).

1018631 is an equidigital number, since it uses as much as digits as its factorization.

1018631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21720.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1018631 is about 1009.2725102766. The cubic root of 1018631 is about 100.6172159404.

The spelling of 1018631 in words is "one million, eighteen thousand, six hundred thirty-one".