158221506 has 16 divisors (see below), whose sum is σ = 327355200. Its totient is φ = 50921808.

The previous prime is 158221487. The next prime is 158221519. The reversal of 158221506 is 605122851.

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, 454486 + ... + 454833.

It is an arithmetic number, because the mean of its divisors is an integer number (20459700).

Almost surely, 2^158221506 is an apocalyptic number.

158221506 is an abundant number, since it is smaller than the sum of its proper divisors (169133694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158221506 is a wasteful number, since it uses less digits than its factorization.

158221506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909353.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 158221506 is about 12578.6130396002. The cubic root of 158221506 is about 540.8645342185.

The spelling of 158221506 in words is "one hundred fifty-eight million, two hundred twenty-one thousand, five hundred six".