1478312621 has 2 divisors, whose sum is σ = 1478312622. Its totient is φ = 1478312620.

The previous prime is 1478312581. The next prime is 1478312663. The reversal of 1478312621 is 1262138741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1150159396 + 328153225 = 33914^2 + 18115^2 .

It is an emirp because it is prime and its reverse (1262138741) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1478312621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1478312021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 739156310 + 739156311.

It is an arithmetic number, because the mean of its divisors is an integer number (739156311).

Almost surely, 2^1478312621 is an apocalyptic number.

It is an amenable number.

1478312621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1478312621 is an equidigital number, since it uses as much as digits as its factorization.

1478312621 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 1478312621 is about 38448.8312046023. The cubic root of 1478312621 is about 1139.1705829591.

The spelling of 1478312621 in words is "one billion, four hundred seventy-eight million, three hundred twelve thousand, six hundred twenty-one".