521131053406 has 4 divisors (see below), whose sum is σ = 781696580112. Its totient is φ = 260565526702.

The previous prime is 521131053307. The next prime is 521131053413. The reversal of 521131053406 is 604350131125.

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, 130282763350 + ... + 130282763353.

It is an arithmetic number, because the mean of its divisors is an integer number (195424145028).

Almost surely, 2^521131053406 is an apocalyptic number.

521131053406 is a deficient number, since it is larger than the sum of its proper divisors (260565526706).

521131053406 is a wasteful number, since it uses less digits than its factorization.

521131053406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260565526705.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 521131053406 in words is "five hundred twenty-one billion, one hundred thirty-one million, fifty-three thousand, four hundred six".