521612701 has 4 divisors (see below), whose sum is σ = 534335004. Its totient is φ = 508890400.

The previous prime is 521612671. The next prime is 521612731. The reversal of 521612701 is 107216125.

521612701 = 16149² + 16150².

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

It is an interprime number because it is at equal distance from previous prime (521612671) and next prime (521612731).

It can be written as a sum of positive squares in 2 ways, for example, as 260790201 + 260822500 = 16149^2 + 16150^2 .

It is a cyclic number.

It is not a de Polignac number, because 521612701 - 2⁷ = 521612573 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521612731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6361090 + ... + 6361171.

It is an arithmetic number, because the mean of its divisors is an integer number (133583751).

Almost surely, 2^521612701 is an apocalyptic number.

521612701 is the 16150-th centered square number.

It is an amenable number.

521612701 is a deficient number, since it is larger than the sum of its proper divisors (12722303).

521612701 is a wasteful number, since it uses less digits than its factorization.

521612701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12722302.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 521612701 is about 22838.8419364906. The cubic root of 521612701 is about 804.9756051401.

Adding to 521612701 its reverse (107216125), we get a palindrome (628828826).

The spelling of 521612701 in words is "five hundred twenty-one million, six hundred twelve thousand, seven hundred one".