137856881 has 2 divisors, whose sum is σ = 137856882. Its totient is φ = 137856880.

The previous prime is 137856877. The next prime is 137856911. The reversal of 137856881 is 188658731.

It is a happy number.

137856881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 20784481 = 10820^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 137856881 - 2² = 137856877 is a prime.

It is a super-2 number, since 2×137856881² = 38009039278096322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137856841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68928440 + 68928441.

It is an arithmetic number, because the mean of its divisors is an integer number (68928441).

Almost surely, 2^137856881 is an apocalyptic number.

It is an amenable number.

137856881 is a deficient number, since it is larger than the sum of its proper divisors (1).

137856881 is an equidigital number, since it uses as much as digits as its factorization.

137856881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 47.

The square root of 137856881 is about 11741.2469951024. The cubic root of 137856881 is about 516.5862188076.

The spelling of 137856881 in words is "one hundred thirty-seven million, eight hundred fifty-six thousand, eight hundred eighty-one".