136221451 has 2 divisors, whose sum is σ = 136221452. Its totient is φ = 136221450.

The previous prime is 136221413. The next prime is 136221461. The reversal of 136221451 is 154122631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136221451 - 2²⁷ = 2003723 is a prime.

It is equal to p_7710541 and since 136221451 and 7710541 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136221401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68110725 + 68110726.

It is an arithmetic number, because the mean of its divisors is an integer number (68110726).

Almost surely, 2^136221451 is an apocalyptic number.

136221451 is a deficient number, since it is larger than the sum of its proper divisors (1).

136221451 is an equidigital number, since it uses as much as digits as its factorization.

136221451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 136221451 is about 11671.3945610625. The cubic root of 136221451 is about 514.5352907284.

The spelling of 136221451 in words is "one hundred thirty-six million, two hundred twenty-one thousand, four hundred fifty-one".