138782537 has 2 divisors, whose sum is σ = 138782538. Its totient is φ = 138782536.

The previous prime is 138782533. The next prime is 138782551. The reversal of 138782537 is 735287831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88811776 + 49970761 = 9424^2 + 7069^2 .

It is a cyclic number.

It is not a de Polignac number, because 138782537 - 2² = 138782533 is a prime.

It is not a weakly prime, because it can be changed into another prime (138782533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69391268 + 69391269.

It is an arithmetic number, because the mean of its divisors is an integer number (69391269).

Almost surely, 2^138782537 is an apocalyptic number.

It is an amenable number.

138782537 is a deficient number, since it is larger than the sum of its proper divisors (1).

138782537 is an equidigital number, since it uses as much as digits as its factorization.

138782537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 44.

The square root of 138782537 is about 11780.6000271633. The cubic root of 138782537 is about 517.7398665535.

The spelling of 138782537 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, five hundred thirty-seven".