159921077 has 12 divisors (see below), whose sum is σ = 164806788. Its totient is φ = 155136000.

The previous prime is 159921071. The next prime is 159921079. The reversal of 159921077 is 770129951.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 53129521 + 106791556 = 7289^2 + 10334^2 .

It is not a de Polignac number, because 159921077 - 2⁸ = 159920821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159921071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622133 + ... + 622389.

It is an arithmetic number, because the mean of its divisors is an integer number (13733899).

Almost surely, 2^159921077 is an apocalyptic number.

It is an amenable number.

159921077 is a deficient number, since it is larger than the sum of its proper divisors (4885711).

159921077 is an equidigital number, since it uses as much as digits as its factorization.

159921077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 159921077 is about 12645.9905503681. The cubic root of 159921077 is about 542.7942461458.

The spelling of 159921077 in words is "one hundred fifty-nine million, nine hundred twenty-one thousand, seventy-seven".