521416261 has 8 divisors (see below), whose sum is σ = 540013824. Its totient is φ = 503131440.

The previous prime is 521416253. The next prime is 521416271. The reversal of 521416261 is 162614125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521416261 - 2³ = 521416253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521416271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74790 + ... + 81463.

It is an arithmetic number, because the mean of its divisors is an integer number (67501728).

Almost surely, 2^521416261 is an apocalyptic number.

It is an amenable number.

521416261 is a deficient number, since it is larger than the sum of its proper divisors (18597563).

521416261 is a wasteful number, since it uses less digits than its factorization.

521416261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156371.

The product of its digits is 2880, while the sum is 28.

The square root of 521416261 is about 22834.5409631987. The cubic root of 521416261 is about 804.8745408433.

The spelling of 521416261 in words is "five hundred twenty-one million, four hundred sixteen thousand, two hundred sixty-one".