20526131261 has 2 divisors, whose sum is σ = 20526131262. Its totient is φ = 20526131260.

The previous prime is 20526131257. The next prime is 20526131333. The reversal of 20526131261 is 16213162502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14885220025 + 5640911236 = 122005^2 + 75106^2 .

It is a cyclic number.

It is not a de Polignac number, because 20526131261 - 2² = 20526131257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20526181261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10263065630 + 10263065631.

It is an arithmetic number, because the mean of its divisors is an integer number (10263065631).

Almost surely, 2^20526131261 is an apocalyptic number.

It is an amenable number.

20526131261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20526131261 is an equidigital number, since it uses as much as digits as its factorization.

20526131261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 20526131261 its reverse (16213162502), we get a palindrome (36739293763).

The spelling of 20526131261 in words is "twenty billion, five hundred twenty-six million, one hundred thirty-one thousand, two hundred sixty-one".