137781265 has 4 divisors (see below), whose sum is σ = 165337524. Its totient is φ = 110225008.

The previous prime is 137781263. The next prime is 137781269. The reversal of 137781265 is 562187731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42601729 + 95179536 = 6527^2 + 9756^2 .

It is a cyclic number.

It is not a de Polignac number, because 137781265 - 2¹ = 137781263 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137781263) 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, 13778122 + ... + 13778131.

It is an arithmetic number, because the mean of its divisors is an integer number (41334381).

Almost surely, 2^137781265 is an apocalyptic number.

It is an amenable number.

137781265 is a deficient number, since it is larger than the sum of its proper divisors (27556259).

137781265 is an equidigital number, since it uses as much as digits as its factorization.

137781265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27556258.

The product of its digits is 70560, while the sum is 40.

The square root of 137781265 is about 11738.0264525175. The cubic root of 137781265 is about 516.4917504782.

The spelling of 137781265 in words is "one hundred thirty-seven million, seven hundred eighty-one thousand, two hundred sixty-five".