136890257 has 8 divisors (see below), whose sum is σ = 158589696. Its totient is φ = 115726752.

The previous prime is 136890253. The next prime is 136890287. The reversal of 136890257 is 752098631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136890257 - 2² = 136890253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136890251) 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 7 ways as a sum of consecutive naturals, for example, 133433 + ... + 134454.

It is an arithmetic number, because the mean of its divisors is an integer number (19823712).

Almost surely, 2^136890257 is an apocalyptic number.

It is an amenable number.

136890257 is a deficient number, since it is larger than the sum of its proper divisors (21699439).

136890257 is an equidigital number, since it uses as much as digits as its factorization.

136890257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267967.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 136890257 is about 11700.0109829008. The cubic root of 136890257 is about 515.3759871002.

The spelling of 136890257 in words is "one hundred thirty-six million, eight hundred ninety thousand, two hundred fifty-seven".