138510491 has 8 divisors (see below), whose sum is σ = 159865824. Its totient is φ = 117547200.

The previous prime is 138510487. The next prime is 138510497. The reversal of 138510491 is 194015831.

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

It is a cyclic number.

It is not a de Polignac number, because 138510491 - 2² = 138510487 is a prime.

It is a super-2 number, since 2×138510491² = 38370312234122162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138510497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97250 + ... + 98663.

It is an arithmetic number, because the mean of its divisors is an integer number (19983228).

Almost surely, 2^138510491 is an apocalyptic number.

138510491 is a deficient number, since it is larger than the sum of its proper divisors (21355333).

138510491 is a wasteful number, since it uses less digits than its factorization.

138510491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196021.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 138510491 is about 11769.0480073794. The cubic root of 138510491 is about 517.4013484772.

The spelling of 138510491 in words is "one hundred thirty-eight million, five hundred ten thousand, four hundred ninety-one".