136861989 has 16 divisors (see below), whose sum is σ = 199341120. Its totient is φ = 82834560.

The previous prime is 136861973. The next prime is 136861999. The reversal of 136861989 is 989168631.

It is not a de Polignac number, because 136861989 - 2⁴ = 136861973 is a prime.

It is a super-2 number, since 2×136861989² = 37462408066072242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136861909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26577 + ... + 31305.

It is an arithmetic number, because the mean of its divisors is an integer number (12458820).

Almost surely, 2^136861989 is an apocalyptic number.

It is an amenable number.

136861989 is a deficient number, since it is larger than the sum of its proper divisors (62479131).

136861989 is a wasteful number, since it uses less digits than its factorization.

136861989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620.

The product of its digits is 559872, while the sum is 51.

The square root of 136861989 is about 11698.8028874753. The cubic root of 136861989 is about 515.3405094077.

The spelling of 136861989 in words is "one hundred thirty-six million, eight hundred sixty-one thousand, nine hundred eighty-nine".