158026861 has 2 divisors, whose sum is σ = 158026862. Its totient is φ = 158026860.

The previous prime is 158026793. The next prime is 158026879. The reversal of 158026861 is 168620851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 37136836 = 10995^2 + 6094^2 .

It is a cyclic number.

It is not a de Polignac number, because 158026861 - 2⁷ = 158026733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158026861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158026061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79013430 + 79013431.

It is an arithmetic number, because the mean of its divisors is an integer number (79013431).

Almost surely, 2^158026861 is an apocalyptic number.

It is an amenable number.

158026861 is a deficient number, since it is larger than the sum of its proper divisors (1).

158026861 is an equidigital number, since it uses as much as digits as its factorization.

158026861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 158026861 is about 12570.8735177791. The cubic root of 158026861 is about 540.6426516606.

It can be divided in two parts, 1580 and 26861, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 158026861 in words is "one hundred fifty-eight million, twenty-six thousand, eight hundred sixty-one".