654138391 has 4 divisors (see below), whose sum is σ = 654338800. Its totient is φ = 653937984.

The previous prime is 654138383. The next prime is 654138437. The reversal of 654138391 is 193831456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654138391 - 2³ = 654138383 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 (654138301) 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, 95226 + ... + 101863.

It is an arithmetic number, because the mean of its divisors is an integer number (163584700).

Almost surely, 2^654138391 is an apocalyptic number.

654138391 is a deficient number, since it is larger than the sum of its proper divisors (200409).

654138391 is a wasteful number, since it uses less digits than its factorization.

654138391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200408.

The product of its digits is 77760, while the sum is 40.

The square root of 654138391 is about 25576.1293201297. The cubic root of 654138391 is about 868.0735950787.

The spelling of 654138391 in words is "six hundred fifty-four million, one hundred thirty-eight thousand, three hundred ninety-one".