513621906 has 16 divisors (see below), whose sum is σ = 1173993024. Its totient is φ = 146749104.

The previous prime is 513621893. The next prime is 513621931. The reversal of 513621906 is 609126315.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6114505 + ... + 6114588.

It is an arithmetic number, because the mean of its divisors is an integer number (73374564).

Almost surely, 2^513621906 is an apocalyptic number.

513621906 is an abundant number, since it is smaller than the sum of its proper divisors (660371118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

513621906 is a wasteful number, since it uses less digits than its factorization.

513621906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12229105.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 513621906 is about 22663.2280578032. The cubic root of 513621906 is about 800.8438522870.

The spelling of 513621906 in words is "five hundred thirteen million, six hundred twenty-one thousand, nine hundred six".