136861837 has 4 divisors (see below), whose sum is σ = 156413536. Its totient is φ = 117310140.

The previous prime is 136861793. The next prime is 136861841. The reversal of 136861837 is 738168631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 738168631 = 3559 ⋅207409.

It is a cyclic number.

It is not a de Polignac number, because 136861837 - 2⁷ = 136861709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136861793 and 136861802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136861867) 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, 9775839 + ... + 9775852.

It is an arithmetic number, because the mean of its divisors is an integer number (39103384).

Almost surely, 2^136861837 is an apocalyptic number.

It is an amenable number.

136861837 is a deficient number, since it is larger than the sum of its proper divisors (19551699).

136861837 is an equidigital number, since it uses as much as digits as its factorization.

136861837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19551698.

The product of its digits is 145152, while the sum is 43.

The square root of 136861837 is about 11698.7963910823. The cubic root of 136861837 is about 515.3403186272.

The spelling of 136861837 in words is "one hundred thirty-six million, eight hundred sixty-one thousand, eight hundred thirty-seven".