1225707761 has 2 divisors, whose sum is σ = 1225707762. Its totient is φ = 1225707760.

The previous prime is 1225707757. The next prime is 1225707793. The reversal of 1225707761 is 1677075221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1047752161 + 177955600 = 32369^2 + 13340^2 .

It is an emirp because it is prime and its reverse (1677075221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225707761 - 2² = 1225707757 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225707731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612853880 + 612853881.

It is an arithmetic number, because the mean of its divisors is an integer number (612853881).

Almost surely, 2^1225707761 is an apocalyptic number.

It is an amenable number.

1225707761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225707761 is an equidigital number, since it uses as much as digits as its factorization.

1225707761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 1225707761 is about 35010.1094114257. The cubic root of 1225707761 is about 1070.1935076698.

The spelling of 1225707761 in words is "one billion, two hundred twenty-five million, seven hundred seven thousand, seven hundred sixty-one".