22156531 has 2 divisors, whose sum is σ = 22156532. Its totient is φ = 22156530.

The previous prime is 22156529. The next prime is 22156543. The reversal of 22156531 is 13565122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22156531 - 2¹ = 22156529 is a prime.

It is a super-2 number, since 2×22156531² = 981823731907922, which contains 22 as substring.

Together with 22156529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22156496 and 22156505.

It is not a weakly prime, because it can be changed into another prime (22156571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078265 + 11078266.

It is an arithmetic number, because the mean of its divisors is an integer number (11078266).

Almost surely, 2^22156531 is an apocalyptic number.

22156531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156531 is an equidigital number, since it uses as much as digits as its factorization.

22156531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 22156531 is about 4707.0724447367. The cubic root of 22156531 is about 280.8669177276.

The spelling of 22156531 in words is "twenty-two million, one hundred fifty-six thousand, five hundred thirty-one".