1238138551 has 8 divisors (see below), whose sum is σ = 1335852224. Its totient is φ = 1140778080.

The previous prime is 1238138549. The next prime is 1238138563. The reversal of 1238138551 is 1558318321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1238138551 - 2¹ = 1238138549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1238138551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238138051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80991 + ... + 95056.

It is an arithmetic number, because the mean of its divisors is an integer number (166981528).

Almost surely, 2^1238138551 is an apocalyptic number.

1238138551 is a deficient number, since it is larger than the sum of its proper divisors (97713673).

1238138551 is a wasteful number, since it uses less digits than its factorization.

1238138551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176601.

The product of its digits is 28800, while the sum is 37.

The square root of 1238138551 is about 35187.1929968845. The cubic root of 1238138551 is about 1073.7992147544.

The spelling of 1238138551 in words is "one billion, two hundred thirty-eight million, one hundred thirty-eight thousand, five hundred fifty-one".