138283531 has 2 divisors, whose sum is σ = 138283532. Its totient is φ = 138283530.

The previous prime is 138283517. The next prime is 138283543. The reversal of 138283531 is 135382831.

It is a strong prime.

It is an emirp because it is prime and its reverse (135382831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138283531 - 2¹³ = 138275339 is a prime.

It is a super-2 number, since 2×138283531² = 38244669891655922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138283231) 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, 69141765 + 69141766.

It is an arithmetic number, because the mean of its divisors is an integer number (69141766).

Almost surely, 2^138283531 is an apocalyptic number.

138283531 is a deficient number, since it is larger than the sum of its proper divisors (1).

138283531 is an equidigital number, since it uses as much as digits as its factorization.

138283531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 138283531 is about 11759.4018130175. The cubic root of 138283531 is about 517.1185934630.

The spelling of 138283531 in words is "one hundred thirty-eight million, two hundred eighty-three thousand, five hundred thirty-one".