138534157 has 4 divisors (see below), whose sum is σ = 138754336. Its totient is φ = 138313980.

The previous prime is 138534119. The next prime is 138534161. The reversal of 138534157 is 751435831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 751435831 = 241 ⋅3117991.

It is a cyclic number.

It is not a de Polignac number, because 138534157 - 2⁷ = 138534029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138534167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109143 + ... + 110404.

It is an arithmetic number, because the mean of its divisors is an integer number (34688584).

Almost surely, 2^138534157 is an apocalyptic number.

It is an amenable number.

138534157 is a deficient number, since it is larger than the sum of its proper divisors (220179).

138534157 is an equidigital number, since it uses as much as digits as its factorization.

138534157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220178.

The product of its digits is 50400, while the sum is 37.

The square root of 138534157 is about 11770.0533983496. The cubic root of 138534157 is about 517.4308146519.

Adding to 138534157 its reverse (751435831), we get a palindrome (889969988).

The spelling of 138534157 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, one hundred fifty-seven".