654391138 has 4 divisors (see below), whose sum is σ = 981586710. Its totient is φ = 327195568.

The previous prime is 654391097. The next prime is 654391169. The reversal of 654391138 is 831193456.

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

It can be written as a sum of positive squares in only one way, i.e., 605012409 + 49378729 = 24597^2 + 7027^2 .

It is a super-2 number, since 2×654391138² = 856455522985870088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 654391138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163597783 + ... + 163597786.

Almost surely, 2^654391138 is an apocalyptic number.

654391138 is a deficient number, since it is larger than the sum of its proper divisors (327195572).

654391138 is a wasteful number, since it uses less digits than its factorization.

654391138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327195571.

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

The square root of 654391138 is about 25581.0699150759. The cubic root of 654391138 is about 868.1853832203.

The spelling of 654391138 in words is "six hundred fifty-four million, three hundred ninety-one thousand, one hundred thirty-eight".