136458781 has 2 divisors, whose sum is σ = 136458782. Its totient is φ = 136458780.

The previous prime is 136458761. The next prime is 136458797. The reversal of 136458781 is 187854631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134792100 + 1666681 = 11610^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 136458781 - 2⁷ = 136458653 is a prime.

It is a super-2 number, since 2×136458781² = 37241997824011922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136458731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68229390 + 68229391.

It is an arithmetic number, because the mean of its divisors is an integer number (68229391).

Almost surely, 2^136458781 is an apocalyptic number.

It is an amenable number.

136458781 is a deficient number, since it is larger than the sum of its proper divisors (1).

136458781 is an equidigital number, since it uses as much as digits as its factorization.

136458781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 136458781 is about 11681.5573020039. The cubic root of 136458781 is about 514.8339314361.

The spelling of 136458781 in words is "one hundred thirty-six million, four hundred fifty-eight thousand, seven hundred eighty-one".