1643001461 has 2 divisors, whose sum is σ = 1643001462. Its totient is φ = 1643001460.

The previous prime is 1643001439. The next prime is 1643001509. The reversal of 1643001461 is 1641003461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 971880625 + 671120836 = 31175^2 + 25906^2 .

It is an emirp because it is prime and its reverse (1641003461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643001461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643001461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643001161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821500730 + 821500731.

It is an arithmetic number, because the mean of its divisors is an integer number (821500731).

Almost surely, 2^1643001461 is an apocalyptic number.

It is an amenable number.

1643001461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643001461 is an equidigital number, since it uses as much as digits as its factorization.

1643001461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1643001461 is about 40533.9544209543. The cubic root of 1643001461 is about 1179.9926890766.

The spelling of 1643001461 in words is "one billion, six hundred forty-three million, one thousand, four hundred sixty-one".