158972281 has 8 divisors (see below), whose sum is σ = 174431880. Its totient is φ = 143974272.

The previous prime is 158972279. The next prime is 158972323. The reversal of 158972281 is 182279851.

158972281 = 8915² + 8916².

It is a happy number.

158972281 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 8173881 + 150798400 = 2859^2 + 12280^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 158972281 - 2¹ = 158972279 is a prime.

It is a super-2 number, since 2×158972281² = 50544372252685922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158972201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114676 + ... + 116053.

It is an arithmetic number, because the mean of its divisors is an integer number (21803985).

Almost surely, 2^158972281 is an apocalyptic number.

158972281 is the 8916-th centered square number.

It is an amenable number.

158972281 is a deficient number, since it is larger than the sum of its proper divisors (15459599).

158972281 is a wasteful number, since it uses less digits than its factorization.

158972281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230795.

The product of its digits is 80640, while the sum is 43.

The square root of 158972281 is about 12608.4210351653. The cubic root of 158972281 is about 541.7186679649.

The spelling of 158972281 in words is "one hundred fifty-eight million, nine hundred seventy-two thousand, two hundred eighty-one".