771001261 has 2 divisors, whose sum is σ = 771001262. Its totient is φ = 771001260.

The previous prime is 771001201. The next prime is 771001267. The reversal of 771001261 is 162100177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682829161 + 88172100 = 26131^2 + 9390^2 .

It is an emirp because it is prime and its reverse (162100177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 771001261 - 2¹¹ = 770999213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771001267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385500630 + 385500631.

It is an arithmetic number, because the mean of its divisors is an integer number (385500631).

Almost surely, 2^771001261 is an apocalyptic number.

It is an amenable number.

771001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

771001261 is an equidigital number, since it uses as much as digits as its factorization.

771001261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 771001261 is about 27766.9094607232. The cubic root of 771001261 is about 916.9627553633.

The spelling of 771001261 in words is "seven hundred seventy-one million, one thousand, two hundred sixty-one".