138472591 has 2 divisors, whose sum is σ = 138472592. Its totient is φ = 138472590.

The previous prime is 138472583. The next prime is 138472637. The reversal of 138472591 is 195274831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138472591 - 2³ = 138472583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138472561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69236295 + 69236296.

It is an arithmetic number, because the mean of its divisors is an integer number (69236296).

Almost surely, 2^138472591 is an apocalyptic number.

138472591 is a deficient number, since it is larger than the sum of its proper divisors (1).

138472591 is an equidigital number, since it uses as much as digits as its factorization.

138472591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 138472591 is about 11767.4377414967. The cubic root of 138472591 is about 517.3541527743.

The spelling of 138472591 in words is "one hundred thirty-eight million, four hundred seventy-two thousand, five hundred ninety-one".