158621261 has 2 divisors, whose sum is σ = 158621262. Its totient is φ = 158621260.

The previous prime is 158621233. The next prime is 158621263. The reversal of 158621261 is 162126851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156000100 + 2621161 = 12490^2 + 1619^2 .

It is an emirp because it is prime and its reverse (162126851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158621261 - 2¹⁴ = 158604877 is a prime.

Together with 158621263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158621263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79310630 + 79310631.

It is an arithmetic number, because the mean of its divisors is an integer number (79310631).

Almost surely, 2^158621261 is an apocalyptic number.

It is an amenable number.

158621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

158621261 is an equidigital number, since it uses as much as digits as its factorization.

158621261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 158621261 is about 12594.4932807954. The cubic root of 158621261 is about 541.3196587484.

The spelling of 158621261 in words is "one hundred fifty-eight million, six hundred twenty-one thousand, two hundred sixty-one".