136421497 has 2 divisors, whose sum is σ = 136421498. Its totient is φ = 136421496.

The previous prime is 136421491. The next prime is 136421521. The reversal of 136421497 is 794124631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124970041 + 11451456 = 11179^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 136421497 - 2³ = 136421489 is a prime.

It is a super-2 number, since 2×136421497² = 37221649687442018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136421491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68210748 + 68210749.

It is an arithmetic number, because the mean of its divisors is an integer number (68210749).

Almost surely, 2^136421497 is an apocalyptic number.

It is an amenable number.

136421497 is a deficient number, since it is larger than the sum of its proper divisors (1).

136421497 is an equidigital number, since it uses as much as digits as its factorization.

136421497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 136421497 is about 11679.9613441141. The cubic root of 136421497 is about 514.7870386024.

The spelling of 136421497 in words is "one hundred thirty-six million, four hundred twenty-one thousand, four hundred ninety-seven".