11905531 has 4 divisors (see below), whose sum is σ = 12987864. Its totient is φ = 10823200.

The previous prime is 11905529. The next prime is 11905541. The reversal of 11905531 is 13550911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11905531 - 2¹ = 11905529 is a prime.

It is a super-2 number, since 2×11905531² = 283483336783922, 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 = 11905496 and 11905505.

It is not an unprimeable number, because it can be changed into a prime (11905501) 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, 541150 + ... + 541171.

It is an arithmetic number, because the mean of its divisors is an integer number (3246966).

Almost surely, 2^11905531 is an apocalyptic number.

11905531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11905531 is a deficient number, since it is larger than the sum of its proper divisors (1082333).

11905531 is a wasteful number, since it uses less digits than its factorization.

11905531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082332.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 11905531 is about 3450.4392474002. The cubic root of 11905531 is about 228.3404872227.

The spelling of 11905531 in words is "eleven million, nine hundred five thousand, five hundred thirty-one".