1240797577 has 2 divisors, whose sum is σ = 1240797578. Its totient is φ = 1240797576.

The previous prime is 1240797541. The next prime is 1240797587. The reversal of 1240797577 is 7757970421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1195154041 + 45643536 = 34571^2 + 6756^2 .

It is an emirp because it is prime and its reverse (7757970421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240797577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240797577.

It is not a weakly prime, because it can be changed into another prime (1240797587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620398788 + 620398789.

It is an arithmetic number, because the mean of its divisors is an integer number (620398789).

Almost surely, 2^1240797577 is an apocalyptic number.

It is an amenable number.

1240797577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240797577 is an equidigital number, since it uses as much as digits as its factorization.

1240797577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864360, while the sum is 49.

The square root of 1240797577 is about 35224.9567352467. The cubic root of 1240797577 is about 1074.5673620883.

The spelling of 1240797577 in words is "one billion, two hundred forty million, seven hundred ninety-seven thousand, five hundred seventy-seven".