159378121 has 4 divisors (see below), whose sum is σ = 182146432. Its totient is φ = 136609812.

The previous prime is 159378119. The next prime is 159378127. The reversal of 159378121 is 121873951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159378121 - 2¹ = 159378119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159378127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11384145 + ... + 11384158.

It is an arithmetic number, because the mean of its divisors is an integer number (45536608).

Almost surely, 2^159378121 is an apocalyptic number.

It is an amenable number.

159378121 is a deficient number, since it is larger than the sum of its proper divisors (22768311).

159378121 is an equidigital number, since it uses as much as digits as its factorization.

159378121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22768310.

The product of its digits is 15120, while the sum is 37.

The square root of 159378121 is about 12624.5047823667. The cubic root of 159378121 is about 542.1792603858.

The spelling of 159378121 in words is "one hundred fifty-nine million, three hundred seventy-eight thousand, one hundred twenty-one".