521525761 has 2 divisors, whose sum is σ = 521525762. Its totient is φ = 521525760.

The previous prime is 521525749. The next prime is 521525773. The reversal of 521525761 is 167525125.

It is a balanced prime because it is at equal distance from previous prime (521525749) and next prime (521525773).

It can be written as a sum of positive squares in only one way, i.e., 512162161 + 9363600 = 22631^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 521525761 - 2⁵ = 521525729 is a prime.

It is not a weakly prime, because it can be changed into another prime (521525791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260762880 + 260762881.

It is an arithmetic number, because the mean of its divisors is an integer number (260762881).

Almost surely, 2^521525761 is an apocalyptic number.

It is an amenable number.

521525761 is a deficient number, since it is larger than the sum of its proper divisors (1).

521525761 is an equidigital number, since it uses as much as digits as its factorization.

521525761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 34.

The square root of 521525761 is about 22836.9385207387. The cubic root of 521525761 is about 804.9308794477.

It can be divided in two parts, 5215 and 25761, that added together give a square (30976 = 176²).

The spelling of 521525761 in words is "five hundred twenty-one million, five hundred twenty-five thousand, seven hundred sixty-one".