22506637 has 2 divisors, whose sum is σ = 22506638. Its totient is φ = 22506636.

The previous prime is 22506629. The next prime is 22506641. The reversal of 22506637 is 73660522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19527561 + 2979076 = 4419^2 + 1726^2 .

It is a cyclic number.

It is not a de Polignac number, because 22506637 - 2³ = 22506629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22506599 and 22506608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22506607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11253318 + 11253319.

It is an arithmetic number, because the mean of its divisors is an integer number (11253319).

Almost surely, 2^22506637 is an apocalyptic number.

It is an amenable number.

22506637 is a deficient number, since it is larger than the sum of its proper divisors (1).

22506637 is an equidigital number, since it uses as much as digits as its factorization.

22506637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 22506637 is about 4744.1160398962. The cubic root of 22506637 is about 282.3385644070.

The spelling of 22506637 in words is "twenty-two million, five hundred six thousand, six hundred thirty-seven".