12290531 has 4 divisors (see below), whose sum is σ = 13407864. Its totient is φ = 11173200.

The previous prime is 12290521. The next prime is 12290567. The reversal of 12290531 is 13509221.

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 12290531 - 2¹⁰ = 12289507 is a prime.

It is a super-2 number, since 2×12290531² = 302114304523922, 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 = 12290497 and 12290506.

It is not an unprimeable number, because it can be changed into a prime (12290501) 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, 558650 + ... + 558671.

It is an arithmetic number, because the mean of its divisors is an integer number (3351966).

Almost surely, 2^12290531 is an apocalyptic number.

12290531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12290531 is a deficient number, since it is larger than the sum of its proper divisors (1117333).

12290531 is a wasteful number, since it uses less digits than its factorization.

12290531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117332.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 12290531 is about 3505.7853613705. The cubic root of 12290531 is about 230.7757736236.

Adding to 12290531 its reverse (13509221), we get a palindrome (25799752).

It can be divided in two parts, 12290 and 531, that added together give a palindrome (12821).

The spelling of 12290531 in words is "twelve million, two hundred ninety thousand, five hundred thirty-one".