521946477 has 16 divisors (see below), whose sum is σ = 832735680. Its totient is φ = 321197616.

The previous prime is 521946433. The next prime is 521946479. The reversal of 521946477 is 774649125.

It is not a de Polignac number, because 521946477 - 2¹⁰ = 521945453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521946479) 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, 743163 + ... + 743864.

It is an arithmetic number, because the mean of its divisors is an integer number (52045980).

Almost surely, 2^521946477 is an apocalyptic number.

It is an amenable number.

521946477 is a deficient number, since it is larger than the sum of its proper divisors (310789203).

521946477 is a wasteful number, since it uses less digits than its factorization.

521946477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487049 (or 1487043 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 521946477 is about 22846.1479685307. The cubic root of 521946477 is about 805.1472677858.

The spelling of 521946477 in words is "five hundred twenty-one million, nine hundred forty-six thousand, four hundred seventy-seven".