138196951 has 4 divisors (see below), whose sum is σ = 138509352. Its totient is φ = 137884552.

The previous prime is 138196931. The next prime is 138196979. The reversal of 138196951 is 159691831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138196951 - 2¹³ = 138188759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138196898 and 138196907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138196901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155536 + ... + 156421.

It is an arithmetic number, because the mean of its divisors is an integer number (34627338).

Almost surely, 2^138196951 is an apocalyptic number.

138196951 is a deficient number, since it is larger than the sum of its proper divisors (312401).

138196951 is an equidigital number, since it uses as much as digits as its factorization.

138196951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312400.

The product of its digits is 58320, while the sum is 43.

The square root of 138196951 is about 11755.7199269122. The cubic root of 138196951 is about 517.0106474318.

The spelling of 138196951 in words is "one hundred thirty-eight million, one hundred ninety-six thousand, nine hundred fifty-one".