521131977 has 12 divisors (see below), whose sum is σ = 763349184. Its totient is φ = 342527640.

The previous prime is 521131969. The next prime is 521131993. The reversal of 521131977 is 779131125.

It is not a de Polignac number, because 521131977 - 2³ = 521131969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521131937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407133 + ... + 408410.

It is an arithmetic number, because the mean of its divisors is an integer number (63612432).

Almost surely, 2^521131977 is an apocalyptic number.

It is an amenable number.

521131977 is a deficient number, since it is larger than the sum of its proper divisors (242217207).

521131977 is a wasteful number, since it uses less digits than its factorization.

521131977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815620 (or 815617 counting only the distinct ones).

The product of its digits is 13230, while the sum is 36.

The square root of 521131977 is about 22828.3152466405. The cubic root of 521131977 is about 804.7282376764.

The spelling of 521131977 in words is "five hundred twenty-one million, one hundred thirty-one thousand, nine hundred seventy-seven".