851110261 has 2 divisors, whose sum is σ = 851110262. Its totient is φ = 851110260.

The previous prime is 851110231. The next prime is 851110277. The reversal of 851110261 is 162011158.

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., 728676036 + 122434225 = 26994^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 851110261 - 2¹³ = 851102069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851110231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425555130 + 425555131.

It is an arithmetic number, because the mean of its divisors is an integer number (425555131).

Almost surely, 2^851110261 is an apocalyptic number.

It is an amenable number.

851110261 is a deficient number, since it is larger than the sum of its proper divisors (1).

851110261 is an equidigital number, since it uses as much as digits as its factorization.

851110261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 851110261 is about 29173.7940796188. The cubic root of 851110261 is about 947.6804949896.

The spelling of 851110261 in words is "eight hundred fifty-one million, one hundred ten thousand, two hundred sixty-one".