159802421 has 2 divisors, whose sum is σ = 159802422. Its totient is φ = 159802420.

The previous prime is 159802411. The next prime is 159802451. The reversal of 159802421 is 124208951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159012100 + 790321 = 12610^2 + 889^2 .

It is an emirp because it is prime and its reverse (124208951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159802421 is a prime.

It is a super-2 number, since 2×159802421² = 51073627514922482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159802411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79901210 + 79901211.

It is an arithmetic number, because the mean of its divisors is an integer number (79901211).

Almost surely, 2^159802421 is an apocalyptic number.

It is an amenable number.

159802421 is a deficient number, since it is larger than the sum of its proper divisors (1).

159802421 is an equidigital number, since it uses as much as digits as its factorization.

159802421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 159802421 is about 12641.2982323810. The cubic root of 159802421 is about 542.6599679739.

The spelling of 159802421 in words is "one hundred fifty-nine million, eight hundred two thousand, four hundred twenty-one".