137326781 has 2 divisors, whose sum is σ = 137326782. Its totient is φ = 137326780.

The previous prime is 137326769. The next prime is 137326789. The reversal of 137326781 is 187623731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 65772100 = 8459^2 + 8110^2 .

It is a cyclic number.

It is not a de Polignac number, because 137326781 - 2²² = 133132477 is a prime.

It is a super-2 number, since 2×137326781² = 37717289559643922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137326789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68663390 + 68663391.

It is an arithmetic number, because the mean of its divisors is an integer number (68663391).

Almost surely, 2^137326781 is an apocalyptic number.

It is an amenable number.

137326781 is a deficient number, since it is larger than the sum of its proper divisors (1).

137326781 is an equidigital number, since it uses as much as digits as its factorization.

137326781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 137326781 is about 11718.6509889151. The cubic root of 137326781 is about 515.9232266144.

The spelling of 137326781 in words is "one hundred thirty-seven million, three hundred twenty-six thousand, seven hundred eighty-one".