521346145 has 4 divisors (see below), whose sum is σ = 625615380. Its totient is φ = 417076912.

The previous prime is 521346131. The next prime is 521346193. The reversal of 521346145 is 541643125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187333969 + 334012176 = 13687^2 + 18276^2 .

It is a cyclic number.

It is not a de Polignac number, because 521346145 - 2⁷ = 521346017 is a prime.

It is a super-2 number, since 2×521346145² = 543603605812722050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52134610 + ... + 52134619.

It is an arithmetic number, because the mean of its divisors is an integer number (156403845).

Almost surely, 2^521346145 is an apocalyptic number.

It is an amenable number.

521346145 is a deficient number, since it is larger than the sum of its proper divisors (104269235).

521346145 is a wasteful number, since it uses less digits than its factorization.

521346145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104269234.

The product of its digits is 14400, while the sum is 31.

The square root of 521346145 is about 22833.0056059206. The cubic root of 521346145 is about 804.8384614717.

The spelling of 521346145 in words is "five hundred twenty-one million, three hundred forty-six thousand, one hundred forty-five".