138437501 has 2 divisors, whose sum is σ = 138437502. Its totient is φ = 138437500.

The previous prime is 138437479. The next prime is 138437557. The reversal of 138437501 is 105734831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124858276 + 13579225 = 11174^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 138437501 - 2¹⁴ = 138421117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138437581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69218750 + 69218751.

It is an arithmetic number, because the mean of its divisors is an integer number (69218751).

Almost surely, 2^138437501 is an apocalyptic number.

It is an amenable number.

138437501 is a deficient number, since it is larger than the sum of its proper divisors (1).

138437501 is an equidigital number, since it uses as much as digits as its factorization.

138437501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 138437501 is about 11765.9466682456. The cubic root of 138437501 is about 517.3104485997.

The spelling of 138437501 in words is "one hundred thirty-eight million, four hundred thirty-seven thousand, five hundred one".