521377172 has 6 divisors (see below), whose sum is σ = 912410058. Its totient is φ = 260688584.

The previous prime is 521377163. The next prime is 521377237. The reversal of 521377172 is 271773125.

It can be written as a sum of positive squares in only one way, i.e., 382750096 + 138627076 = 19564^2 + 11774^2 .

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, 65172143 + ... + 65172150.

It is an arithmetic number, because the mean of its divisors is an integer number (152068343).

Almost surely, 2^521377172 is an apocalyptic number.

It is an amenable number.

521377172 is a deficient number, since it is larger than the sum of its proper divisors (391032886).

521377172 is a wasteful number, since it uses less digits than its factorization.

521377172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130344297 (or 130344295 counting only the distinct ones).

The product of its digits is 20580, while the sum is 35.

The square root of 521377172 is about 22833.6850289216. The cubic root of 521377172 is about 804.8544273373.

The spelling of 521377172 in words is "five hundred twenty-one million, three hundred seventy-seven thousand, one hundred seventy-two".