138454831 has 2 divisors, whose sum is σ = 138454832. Its totient is φ = 138454830.

The previous prime is 138454829. The next prime is 138454837.

138454831 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 138454831 - 2¹ = 138454829 is a prime.

It is a super-2 number, since 2×138454831² = 38339480454477122, which contains 22 as substring.

Together with 138454829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138454837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69227415 + 69227416.

It is an arithmetic number, because the mean of its divisors is an integer number (69227416).

Almost surely, 2^138454831 is an apocalyptic number.

138454831 is a deficient number, since it is larger than the sum of its proper divisors (1).

138454831 is an equidigital number, since it uses as much as digits as its factorization.

138454831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 138454831 is about 11766.6830925287. The cubic root of 138454831 is about 517.3320338300.

The spelling of 138454831 in words is "one hundred thirty-eight million, four hundred fifty-four thousand, eight hundred thirty-one".