11405631 has 16 divisors (see below), whose sum is σ = 16210944. Its totient is φ = 7116384.

The previous prime is 11405609. The next prime is 11405633. The reversal of 11405631 is 13650411.

11405631 = 124² + 125² + ... + 330².

It is not a de Polignac number, because 11405631 - 2¹³ = 11397439 is a prime.

It is a super-2 number, since 2×11405631² = 260176837016322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11405598 and 11405607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405633) 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 15 ways as a sum of consecutive naturals, for example, 1485 + ... + 5001.

It is an arithmetic number, because the mean of its divisors is an integer number (1013184).

Almost surely, 2^11405631 is an apocalyptic number.

11405631 is a deficient number, since it is larger than the sum of its proper divisors (4805313).

11405631 is a wasteful number, since it uses less digits than its factorization.

11405631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 11405631 is about 3377.2223794118. Note that the first 3 decimals coincide. The cubic root of 11405631 is about 225.0987615815.

The spelling of 11405631 in words is "eleven million, four hundred five thousand, six hundred thirty-one".