22151551 has 2 divisors, whose sum is σ = 22151552. Its totient is φ = 22151550.

The previous prime is 22151539. The next prime is 22151573. The reversal of 22151551 is 15515122.

It is a happy number.

It is an a-pointer prime, because the next prime (22151573) can be obtained adding 22151551 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22151551 - 2⁹ = 22151039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22151651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11075775 + 11075776.

It is an arithmetic number, because the mean of its divisors is an integer number (11075776).

Almost surely, 2^22151551 is an apocalyptic number.

22151551 is a deficient number, since it is larger than the sum of its proper divisors (1).

22151551 is an equidigital number, since it uses as much as digits as its factorization.

22151551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500, while the sum is 22.

The square root of 22151551 is about 4706.5434237878. The cubic root of 22151551 is about 280.8458731869.

Adding to 22151551 its reverse (15515122), we get a palindrome (37666673).

The spelling of 22151551 in words is "twenty-two million, one hundred fifty-one thousand, five hundred fifty-one".