215351506 has 12 divisors (see below), whose sum is σ = 334552842. Its totient is φ = 103961984.

The previous prime is 215351489. The next prime is 215351537. The reversal of 215351506 is 605153512.

It can be written as a sum of positive squares in 3 ways, for example, as 184715281 + 30636225 = 13591^2 + 5535^2 .

It is a super-2 number, since 2×215351506² = 92752542272936072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62335 + ... + 65698.

Almost surely, 2^215351506 is an apocalyptic number.

215351506 is a deficient number, since it is larger than the sum of its proper divisors (119201336).

215351506 is a wasteful number, since it uses less digits than its factorization.

215351506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128093 (or 128064 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 215351506 is about 14674.8596586134. The cubic root of 215351506 is about 599.3989406731.

The spelling of 215351506 in words is "two hundred fifteen million, three hundred fifty-one thousand, five hundred six".