1241399977 has 2 divisors, whose sum is σ = 1241399978. Its totient is φ = 1241399976.

The previous prime is 1241399947. The next prime is 1241400023. The reversal of 1241399977 is 7799931421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947654656 + 293745321 = 30784^2 + 17139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1241399977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1241399947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620699988 + 620699989.

It is an arithmetic number, because the mean of its divisors is an integer number (620699989).

Almost surely, 2^1241399977 is an apocalyptic number.

It is an amenable number.

1241399977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241399977 is an equidigital number, since it uses as much as digits as its factorization.

1241399977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 1241399977 is about 35233.5064533747. The cubic root of 1241399977 is about 1074.7412326864.

The spelling of 1241399977 in words is "one billion, two hundred forty-one million, three hundred ninety-nine thousand, nine hundred seventy-seven".