1264180861 has 2 divisors, whose sum is σ = 1264180862. Its totient is φ = 1264180860.

The previous prime is 1264180849. The next prime is 1264180889. The reversal of 1264180861 is 1680814621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 848265625 + 415915236 = 29125^2 + 20394^2 .

It is an emirp because it is prime and its reverse (1680814621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1264180861 - 2⁵ = 1264180829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1264180861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264180811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632090430 + 632090431.

It is an arithmetic number, because the mean of its divisors is an integer number (632090431).

Almost surely, 2^1264180861 is an apocalyptic number.

It is an amenable number.

1264180861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264180861 is an equidigital number, since it uses as much as digits as its factorization.

1264180861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1264180861 is about 35555.3211348175. The cubic root of 1264180861 is about 1081.2756021158.

The spelling of 1264180861 in words is "one billion, two hundred sixty-four million, one hundred eighty thousand, eight hundred sixty-one".