643149502 has 4 divisors (see below), whose sum is σ = 964724256. Its totient is φ = 321574750.

The previous prime is 643149499. The next prime is 643149523. The reversal of 643149502 is 205941346.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160787374 + ... + 160787377.

It is an arithmetic number, because the mean of its divisors is an integer number (241181064).

Almost surely, 2^643149502 is an apocalyptic number.

643149502 is a deficient number, since it is larger than the sum of its proper divisors (321574754).

643149502 is a wasteful number, since it uses less digits than its factorization.

643149502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321574753.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 643149502 is about 25360.3923865543. The cubic root of 643149502 is about 863.1851877138.

The spelling of 643149502 in words is "six hundred forty-three million, one hundred forty-nine thousand, five hundred two".