2131219777 has 2 divisors, whose sum is σ = 2131219778. Its totient is φ = 2131219776.

The previous prime is 2131219757. The next prime is 2131219781. The reversal of 2131219777 is 7779121312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165812736 + 965407041 = 34144^2 + 31071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131219777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131219757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065609888 + 1065609889.

It is an arithmetic number, because the mean of its divisors is an integer number (1065609889).

Almost surely, 2^2131219777 is an apocalyptic number.

It is an amenable number.

2131219777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131219777 is an equidigital number, since it uses as much as digits as its factorization.

2131219777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37044, while the sum is 40.

The square root of 2131219777 is about 46165.1359469459. The cubic root of 2131219777 is about 1286.8939106254.

The spelling of 2131219777 in words is "two billion, one hundred thirty-one million, two hundred nineteen thousand, seven hundred seventy-seven".