158721461 has 2 divisors, whose sum is σ = 158721462. Its totient is φ = 158721460.

The previous prime is 158721449. The next prime is 158721499. The reversal of 158721461 is 164127851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139972561 + 18748900 = 11831^2 + 4330^2 .

It is an emirp because it is prime and its reverse (164127851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158721461 - 2¹⁰ = 158720437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158720461) 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 as a sum of consecutive naturals, namely, 79360730 + 79360731.

It is an arithmetic number, because the mean of its divisors is an integer number (79360731).

Almost surely, 2^158721461 is an apocalyptic number.

It is an amenable number.

158721461 is a deficient number, since it is larger than the sum of its proper divisors (1).

158721461 is an equidigital number, since it uses as much as digits as its factorization.

158721461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 158721461 is about 12598.4705817809. The cubic root of 158721461 is about 541.4336174372.

The spelling of 158721461 in words is "one hundred fifty-eight million, seven hundred twenty-one thousand, four hundred sixty-one".