136161431 has 4 divisors (see below), whose sum is σ = 155613072. Its totient is φ = 116709792.

The previous prime is 136161419. The next prime is 136161461. The reversal of 136161431 is 134161631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134161631 = 61 ⋅2199371.

It is a cyclic number.

It is not a de Polignac number, because 136161431 - 2¹⁴ = 136145047 is a prime.

It is a super-2 number, since 2×136161431² = 37079870583935522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136161431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136161401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9725810 + ... + 9725823.

It is an arithmetic number, because the mean of its divisors is an integer number (38903268).

Almost surely, 2^136161431 is an apocalyptic number.

136161431 is a deficient number, since it is larger than the sum of its proper divisors (19451641).

136161431 is an equidigital number, since it uses as much as digits as its factorization.

136161431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19451640.

The product of its digits is 1296, while the sum is 26.

The square root of 136161431 is about 11668.8230340510. The cubic root of 136161431 is about 514.4597105006.

The spelling of 136161431 in words is "one hundred thirty-six million, one hundred sixty-one thousand, four hundred thirty-one".