137099861 has 2 divisors, whose sum is σ = 137099862. Its totient is φ = 137099860.

The previous prime is 137099857. The next prime is 137099881. The reversal of 137099861 is 168990731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94458961 + 42640900 = 9719^2 + 6530^2 .

It is a cyclic number.

It is not a de Polignac number, because 137099861 - 2² = 137099857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137099881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68549930 + 68549931.

It is an arithmetic number, because the mean of its divisors is an integer number (68549931).

Almost surely, 2^137099861 is an apocalyptic number.

It is an amenable number.

137099861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137099861 is an equidigital number, since it uses as much as digits as its factorization.

137099861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 137099861 is about 11708.9649841478. The cubic root of 137099861 is about 515.6388978978.

The spelling of 137099861 in words is "one hundred thirty-seven million, ninety-nine thousand, eight hundred sixty-one".