138550881 has 24 divisors (see below), whose sum is σ = 216891840. Its totient is φ = 78436512.

The previous prime is 138550879. The next prime is 138550883. The reversal of 138550881 is 188055831.

It is an interprime number because it is at equal distance from previous prime (138550879) and next prime (138550883).

It is not a de Polignac number, because 138550881 - 2¹ = 138550879 is a prime.

It is a super-2 number, since 2×138550881² = 38392693251752322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138550883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11700 + ... + 20346.

It is an arithmetic number, because the mean of its divisors is an integer number (9037160).

Almost surely, 2^138550881 is an apocalyptic number.

It is an amenable number.

138550881 is a deficient number, since it is larger than the sum of its proper divisors (78340959).

138550881 is a wasteful number, since it uses less digits than its factorization.

138550881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8773 (or 8766 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 138550881 is about 11770.7638239836. The cubic root of 138550881 is about 517.4516354250.

The spelling of 138550881 in words is "one hundred thirty-eight million, five hundred fifty thousand, eight hundred eighty-one".