136881031 has 4 divisors (see below), whose sum is σ = 156435472. Its totient is φ = 117326592.

The previous prime is 136881023. The next prime is 136881037. The reversal of 136881031 is 130188631.

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 136881031 - 2³ = 136881023 is a prime.

It is a super-2 number, since 2×136881031² = 37472833295245922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136880984 and 136881002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136881037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9777210 + ... + 9777223.

It is an arithmetic number, because the mean of its divisors is an integer number (39108868).

Almost surely, 2^136881031 is an apocalyptic number.

136881031 is a deficient number, since it is larger than the sum of its proper divisors (19554441).

136881031 is an equidigital number, since it uses as much as digits as its factorization.

136881031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19554440.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 136881031 is about 11699.6167031232. The cubic root of 136881031 is about 515.3644085657.

The spelling of 136881031 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, thirty-one".