136447257 has 4 divisors (see below), whose sum is σ = 181929680. Its totient is φ = 90964836.

The previous prime is 136447249. The next prime is 136447277. The reversal of 136447257 is 752744631.

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.

It is not a de Polignac number, because 136447257 - 2³ = 136447249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136447277) 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, 22741207 + ... + 22741212.

It is an arithmetic number, because the mean of its divisors is an integer number (45482420).

Almost surely, 2^136447257 is an apocalyptic number.

It is an amenable number.

136447257 is a deficient number, since it is larger than the sum of its proper divisors (45482423).

136447257 is an equidigital number, since it uses as much as digits as its factorization.

136447257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45482422.

The product of its digits is 141120, while the sum is 39.

The square root of 136447257 is about 11681.0640354379. The cubic root of 136447257 is about 514.8194383825.

The spelling of 136447257 in words is "one hundred thirty-six million, four hundred forty-seven thousand, two hundred fifty-seven".