2381631 has 32 divisors (see below), whose sum is σ = 3932160. Its totient is φ = 1251936.

The previous prime is 2381629. The next prime is 2381633. The reversal of 2381631 is 1361832.

2381631 = T₁₂₈ + T₁₂₉ + ... + T₂₅₃.

It is an interprime number because it is at equal distance from previous prime (2381629) and next prime (2381633).

It is not a de Polignac number, because 2381631 - 2¹ = 2381629 is a prime.

It is a super-2 number, since 2×2381631² = 11344332440322, which contains 22 as substring.

2381631 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18690 + ... + 18816.

It is an arithmetic number, because the mean of its divisors is an integer number (122880).

2^2381631 is an apocalyptic number.

2381631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2381631 is a deficient number, since it is larger than the sum of its proper divisors (1550529).

2381631 is a wasteful number, since it uses less digits than its factorization.

2381631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203.

The product of its digits is 864, while the sum is 24.

The square root of 2381631 is about 1543.2533816584. The cubic root of 2381631 is about 133.5441366779.

The spelling of 2381631 in words is "two million, three hundred eighty-one thousand, six hundred thirty-one".