158421437 has 2 divisors, whose sum is σ = 158421438. Its totient is φ = 158421436.

The previous prime is 158421421. The next prime is 158421481. The reversal of 158421437 is 734124851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158281561 + 139876 = 12581^2 + 374^2 .

It is an emirp because it is prime and its reverse (734124851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158421437 - 2⁴ = 158421421 is a prime.

It is a super-2 number, since 2×158421437² = 50194703402289938, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 158421397 and 158421406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158421937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79210718 + 79210719.

It is an arithmetic number, because the mean of its divisors is an integer number (79210719).

Almost surely, 2^158421437 is an apocalyptic number.

It is an amenable number.

158421437 is a deficient number, since it is larger than the sum of its proper divisors (1).

158421437 is an equidigital number, since it uses as much as digits as its factorization.

158421437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 158421437 is about 12586.5577899599. The cubic root of 158421437 is about 541.0922530975.

The spelling of 158421437 in words is "one hundred fifty-eight million, four hundred twenty-one thousand, four hundred thirty-seven".