639191354 has 12 divisors (see below), whose sum is σ = 985035354. Its totient is φ = 310852152.

The previous prime is 639191341. The next prime is 639191359. The reversal of 639191354 is 453191936.

It can be written as a sum of positive squares in only one way, i.e., 423248329 + 215943025 = 20573^2 + 14695^2 .

It is a super-3 number, since 3×639191354³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (639191359) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 216017 + ... + 218955.

Almost surely, 2^639191354 is an apocalyptic number.

639191354 is a deficient number, since it is larger than the sum of its proper divisors (345844000).

639191354 is an frugal number, since it uses more digits than its factorization.

639191354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5917 (or 2978 counting only the distinct ones).

The product of its digits is 87480, while the sum is 41.

The square root of 639191354 is about 25282.2339598383. The cubic root of 639191354 is about 861.4107699166.

The spelling of 639191354 in words is "six hundred thirty-nine million, one hundred ninety-one thousand, three hundred fifty-four".