138547951 has 2 divisors, whose sum is σ = 138547952. Its totient is φ = 138547950.

The previous prime is 138547949. The next prime is 138547957. The reversal of 138547951 is 159745831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138547951 - 2¹ = 138547949 is a prime.

Together with 138547949, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 138547898 and 138547907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138547957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69273975 + 69273976.

It is an arithmetic number, because the mean of its divisors is an integer number (69273976).

Almost surely, 2^138547951 is an apocalyptic number.

138547951 is a deficient number, since it is larger than the sum of its proper divisors (1).

138547951 is an equidigital number, since it uses as much as digits as its factorization.

138547951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 138547951 is about 11770.6393624136. The cubic root of 138547951 is about 517.4479878024.

The spelling of 138547951 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred fifty-one".