11890631 has 4 divisors (see below), whose sum is σ = 11901792. Its totient is φ = 11879472.

The previous prime is 11890621. The next prime is 11890643. The reversal of 11890631 is 13609811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11890631 - 2¹⁰ = 11889607 is a prime.

It is a super-2 number, since 2×11890631² = 282774211156322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11890594 and 11890603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11890601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3791 + ... + 6176.

It is an arithmetic number, because the mean of its divisors is an integer number (2975448).

Almost surely, 2^11890631 is an apocalyptic number.

11890631 is a deficient number, since it is larger than the sum of its proper divisors (11161).

11890631 is an equidigital number, since it uses as much as digits as its factorization.

11890631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 11890631 is about 3448.2794260326. The cubic root of 11890631 is about 228.2451899589.

It can be divided in two parts, 11890 and 631, that added together give a palindrome (12521).

The spelling of 11890631 in words is "eleven million, eight hundred ninety thousand, six hundred thirty-one".