137539861 has 2 divisors, whose sum is σ = 137539862. Its totient is φ = 137539860.

The previous prime is 137539849. The next prime is 137539873. The reversal of 137539861 is 168935731.

It is a balanced prime because it is at equal distance from previous prime (137539849) and next prime (137539873).

It can be written as a sum of positive squares in only one way, i.e., 92044836 + 45495025 = 9594^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 137539861 - 2⁷ = 137539733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137539891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68769930 + 68769931.

It is an arithmetic number, because the mean of its divisors is an integer number (68769931).

Almost surely, 2^137539861 is an apocalyptic number.

It is an amenable number.

137539861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137539861 is an equidigital number, since it uses as much as digits as its factorization.

137539861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 137539861 is about 11727.7389551439. The cubic root of 137539861 is about 516.1899289307.

The spelling of 137539861 in words is "one hundred thirty-seven million, five hundred thirty-nine thousand, eight hundred sixty-one".