523031521261 has 2 divisors, whose sum is σ = 523031521262. Its totient is φ = 523031521260.

The previous prime is 523031521249. The next prime is 523031521277. The reversal of 523031521261 is 162125130325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522967617225 + 63904036 = 723165^2 + 7994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523031521261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523031521231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261515760630 + 261515760631.

It is an arithmetic number, because the mean of its divisors is an integer number (261515760631).

Almost surely, 2^523031521261 is an apocalyptic number.

It is an amenable number.

523031521261 is a deficient number, since it is larger than the sum of its proper divisors (1).

523031521261 is an equidigital number, since it uses as much as digits as its factorization.

523031521261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 523031521261 its reverse (162125130325), we get a palindrome (685156651586).

The spelling of 523031521261 in words is "five hundred twenty-three billion, thirty-one million, five hundred twenty-one thousand, two hundred sixty-one".