1723821461 has 2 divisors, whose sum is σ = 1723821462. Its totient is φ = 1723821460.

The previous prime is 1723821431. The next prime is 1723821469. The reversal of 1723821461 is 1641283271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1403626225 + 320195236 = 37465^2 + 17894^2 .

It is a cyclic number.

It is not a de Polignac number, because 1723821461 - 2²⁶ = 1656712597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1723821469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861910730 + 861910731.

It is an arithmetic number, because the mean of its divisors is an integer number (861910731).

Almost surely, 2^1723821461 is an apocalyptic number.

It is an amenable number.

1723821461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1723821461 is an equidigital number, since it uses as much as digits as its factorization.

1723821461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 1723821461 is about 41518.9289481316. The cubic root of 1723821461 is about 1199.0319649019.

The spelling of 1723821461 in words is "one billion, seven hundred twenty-three million, eight hundred twenty-one thousand, four hundred sixty-one".