22151506 has 12 divisors (see below), whose sum is σ = 35980362. Its totient is φ = 10223616.

The previous prime is 22151497. The next prime is 22151539. The reversal of 22151506 is 60515122.

It can be written as a sum of positive squares in 3 ways, for example, as 18879025 + 3272481 = 4345^2 + 1809^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32431 + ... + 33106.

Almost surely, 2^22151506 is an apocalyptic number.

22151506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

22151506 is a deficient number, since it is larger than the sum of its proper divisors (13828856).

22151506 is a wasteful number, since it uses less digits than its factorization.

22151506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65565 (or 65552 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 22151506 is about 4706.5386432069. The cubic root of 22151506 is about 280.8456830110.

Adding to 22151506 its reverse (60515122), we get a palindrome (82666628).

It can be divided in two parts, 2215 and 1506, that added together give a square (3721 = 61²).

The spelling of 22151506 in words is "twenty-two million, one hundred fifty-one thousand, five hundred six".