155631226 has 16 divisors (see below), whose sum is σ = 255704040. Its totient is φ = 70712320.

The previous prime is 155631199. The next prime is 155631247. The reversal of 155631226 is 622136551.

It can be written as a sum of positive squares in 4 ways, for example, as 110271001 + 45360225 = 10501^2 + 6735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77935 + ... + 79906.

Almost surely, 2^155631226 is an apocalyptic number.

155631226 is a deficient number, since it is larger than the sum of its proper divisors (100072814).

155631226 is a wasteful number, since it uses less digits than its factorization.

155631226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157889.

The product of its digits is 10800, while the sum is 31.

The square root of 155631226 is about 12475.2244869581. The cubic root of 155631226 is about 537.8967408686.

Adding to 155631226 its reverse (622136551), we get a palindrome (777767777).

The spelling of 155631226 in words is "one hundred fifty-five million, six hundred thirty-one thousand, two hundred twenty-six".