159142421 has 2 divisors, whose sum is σ = 159142422. Its totient is φ = 159142420.

The previous prime is 159142397. The next prime is 159142433. The reversal of 159142421 is 124241951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159012100 + 130321 = 12610^2 + 361^2 .

It is an emirp because it is prime and its reverse (124241951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159142421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159142021) 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 as a sum of consecutive naturals, namely, 79571210 + 79571211.

It is an arithmetic number, because the mean of its divisors is an integer number (79571211).

Almost surely, 2^159142421 is an apocalyptic number.

It is an amenable number.

159142421 is a deficient number, since it is larger than the sum of its proper divisors (1).

159142421 is an equidigital number, since it uses as much as digits as its factorization.

159142421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 159142421 is about 12615.1663088522. The cubic root of 159142421 is about 541.9118571007.

The spelling of 159142421 in words is "one hundred fifty-nine million, one hundred forty-two thousand, four hundred twenty-one".