137981533 has 2 divisors, whose sum is σ = 137981534. Its totient is φ = 137981532.

The previous prime is 137981497. The next prime is 137981587. The reversal of 137981533 is 335189731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131721529 + 6260004 = 11477^2 + 2502^2 .

It is a cyclic number.

It is not a de Polignac number, because 137981533 - 2²⁵ = 104427101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137931533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68990766 + 68990767.

It is an arithmetic number, because the mean of its divisors is an integer number (68990767).

Almost surely, 2^137981533 is an apocalyptic number.

It is an amenable number.

137981533 is a deficient number, since it is larger than the sum of its proper divisors (1).

137981533 is an equidigital number, since it uses as much as digits as its factorization.

137981533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 137981533 is about 11746.5540904556. The cubic root of 137981533 is about 516.7418732470.

The spelling of 137981533 in words is "one hundred thirty-seven million, nine hundred eighty-one thousand, five hundred thirty-three".