22154999 has 2 divisors, whose sum is σ = 22155000. Its totient is φ = 22154998.

The previous prime is 22154981. The next prime is 22155011. The reversal of 22154999 is 99945122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22154999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22154929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077499 + 11077500.

It is an arithmetic number, because the mean of its divisors is an integer number (11077500).

Almost surely, 2^22154999 is an apocalyptic number.

22154999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22154999 is an equidigital number, since it uses as much as digits as its factorization.

22154999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 22154999 is about 4706.9097080781. The cubic root of 22154999 is about 280.8604441204.

The spelling of 22154999 in words is "twenty-two million, one hundred fifty-four thousand, nine hundred ninety-nine".