8742520261 has 2 divisors, whose sum is σ = 8742520262. Its totient is φ = 8742520260.

The previous prime is 8742520201. The next prime is 8742520313. The reversal of 8742520261 is 1620252478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7942196161 + 800324100 = 89119^2 + 28290^2 .

It is a cyclic number.

It is not a de Polignac number, because 8742520261 - 2¹³ = 8742512069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8742520261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8742520201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4371260130 + 4371260131.

It is an arithmetic number, because the mean of its divisors is an integer number (4371260131).

Almost surely, 2^8742520261 is an apocalyptic number.

It is an amenable number.

8742520261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8742520261 is an equidigital number, since it uses as much as digits as its factorization.

8742520261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 8742520261 is about 93501.4452348198. The cubic root of 8742520261 is about 2060.0553179760.

It can be divided in two parts, 874 and 2520261, that added together give a triangular number (2521135 = T₂₂₄₅).

The spelling of 8742520261 in words is "eight billion, seven hundred forty-two million, five hundred twenty thousand, two hundred sixty-one".