136722019 has 4 divisors (see below), whose sum is σ = 156253744. Its totient is φ = 117190296.

The previous prime is 136722017. The next prime is 136722023. The reversal of 136722019 is 910227631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136722019 - 2¹ = 136722017 is a prime.

It is a super-2 number, since 2×136722019² = 37385820958872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136722011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9765852 + ... + 9765865.

It is an arithmetic number, because the mean of its divisors is an integer number (39063436).

Almost surely, 2^136722019 is an apocalyptic number.

136722019 is a deficient number, since it is larger than the sum of its proper divisors (19531725).

136722019 is an equidigital number, since it uses as much as digits as its factorization.

136722019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19531724.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 136722019 is about 11692.8191211529. The cubic root of 136722019 is about 515.1647683425.

The spelling of 136722019 in words is "one hundred thirty-six million, seven hundred twenty-two thousand, nineteen".