2172777461 has 2 divisors, whose sum is σ = 2172777462. Its totient is φ = 2172777460.

The previous prime is 2172777437. The next prime is 2172777473. The reversal of 2172777461 is 1647772712.

2172777461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1822863025 + 349914436 = 42695^2 + 18706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2172777461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172777421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086388730 + 1086388731.

It is an arithmetic number, because the mean of its divisors is an integer number (1086388731).

Almost surely, 2^2172777461 is an apocalyptic number.

It is an amenable number.

2172777461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172777461 is an equidigital number, since it uses as much as digits as its factorization.

2172777461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230496, while the sum is 44.

The square root of 2172777461 is about 46613.0610558886. The cubic root of 2172777461 is about 1295.2047123492.

The spelling of 2172777461 in words is "two billion, one hundred seventy-two million, seven hundred seventy-seven thousand, four hundred sixty-one".