138350551 has 4 divisors (see below), whose sum is σ = 142813504. Its totient is φ = 133887600.

The previous prime is 138350521. The next prime is 138350581. The reversal of 138350551 is 155053831.

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

It is an interprime number because it is at equal distance from previous prime (138350521) and next prime (138350581).

It is a cyclic number.

It is not a de Polignac number, because 138350551 - 2⁷ = 138350423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4462921 = 138350551 / (1 + 3 + 8 + 3 + 5 + 0 + 5 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138350521) 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, 2231430 + ... + 2231491.

It is an arithmetic number, because the mean of its divisors is an integer number (35703376).

Almost surely, 2^138350551 is an apocalyptic number.

138350551 is a deficient number, since it is larger than the sum of its proper divisors (4462953).

138350551 is an equidigital number, since it uses as much as digits as its factorization.

138350551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4462952.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 138350551 is about 11762.2511025739. The cubic root of 138350551 is about 517.2021215844.

The spelling of 138350551 in words is "one hundred thirty-eight million, three hundred fifty thousand, five hundred fifty-one".