158638537 has 2 divisors, whose sum is σ = 158638538. Its totient is φ = 158638536.

The previous prime is 158638523. The next prime is 158638547. The reversal of 158638537 is 735836851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135396496 + 23242041 = 11636^2 + 4821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158638537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158638507) 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, 79319268 + 79319269.

It is an arithmetic number, because the mean of its divisors is an integer number (79319269).

Almost surely, 2^158638537 is an apocalyptic number.

It is an amenable number.

158638537 is a deficient number, since it is larger than the sum of its proper divisors (1).

158638537 is an equidigital number, since it uses as much as digits as its factorization.

158638537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The square root of 158638537 is about 12595.1791174243. The cubic root of 158638537 is about 541.3393103783.

The spelling of 158638537 in words is "one hundred fifty-eight million, six hundred thirty-eight thousand, five hundred thirty-seven".