521019394 has 32 divisors (see below), whose sum is σ = 929761920. Its totient is φ = 214244352.

The previous prime is 521019341. The next prime is 521019397. The reversal of 521019394 is 493910125.

It is a super-2 number, since 2×521019394² = 542922417848254472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521019397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62242 + ... + 70114.

It is an arithmetic number, because the mean of its divisors is an integer number (29055060).

Almost surely, 2^521019394 is an apocalyptic number.

521019394 is a deficient number, since it is larger than the sum of its proper divisors (408742526).

521019394 is a wasteful number, since it uses less digits than its factorization.

521019394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8074.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 521019394 is about 22825.8492503565. The cubic root of 521019394 is about 804.6702835508.

The spelling of 521019394 in words is "five hundred twenty-one million, nineteen thousand, three hundred ninety-four".