22161751 has 2 divisors, whose sum is σ = 22161752. Its totient is φ = 22161750.

The previous prime is 22161721. The next prime is 22161767. The reversal of 22161751 is 15716122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22161751 is a prime.

It is a super-2 number, since 2×22161751² = 982286414772002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22161701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11080875 + 11080876.

It is an arithmetic number, because the mean of its divisors is an integer number (11080876).

Almost surely, 2^22161751 is an apocalyptic number.

22161751 is a deficient number, since it is larger than the sum of its proper divisors (1).

22161751 is an equidigital number, since it uses as much as digits as its factorization.

22161751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 22161751 is about 4707.6268968558. The cubic root of 22161751 is about 280.8889730784. Note that the first 3 decimals are identical.

Adding to 22161751 its reverse (15716122), we get a palindrome (37877873).

The spelling of 22161751 in words is "twenty-two million, one hundred sixty-one thousand, seven hundred fifty-one".