22131493 has 2 divisors, whose sum is σ = 22131494. Its totient is φ = 22131492.

The previous prime is 22131479. The next prime is 22131509. The reversal of 22131493 is 39413122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 4809249 = 4162^2 + 2193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22131493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22131443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065746 + 11065747.

It is an arithmetic number, because the mean of its divisors is an integer number (11065747).

Almost surely, 2^22131493 is an apocalyptic number.

It is an amenable number.

22131493 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131493 is an equidigital number, since it uses as much as digits as its factorization.

22131493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 22131493 is about 4704.4120780391. The cubic root of 22131493 is about 280.7610799122.

The spelling of 22131493 in words is "twenty-two million, one hundred thirty-one thousand, four hundred ninety-three".