158004421 has 2 divisors, whose sum is σ = 158004422. Its totient is φ = 158004420.

The previous prime is 158004389. The next prime is 158004461. The reversal of 158004421 is 124400851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156600196 + 1404225 = 12514^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 158004421 - 2⁵ = 158004389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158004461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79002210 + 79002211.

It is an arithmetic number, because the mean of its divisors is an integer number (79002211).

Almost surely, 2^158004421 is an apocalyptic number.

It is an amenable number.

158004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

158004421 is an equidigital number, since it uses as much as digits as its factorization.

158004421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 158004421 is about 12569.9809466840. The cubic root of 158004421 is about 540.6170598186.

The spelling of 158004421 in words is "one hundred fifty-eight million, four thousand, four hundred twenty-one".