1621314073 has 2 divisors, whose sum is σ = 1621314074. Its totient is φ = 1621314072.

The previous prime is 1621314053. The next prime is 1621314109. The reversal of 1621314073 is 3704131261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464363289 + 156950784 = 38267^2 + 12528^2 .

It is an emirp because it is prime and its reverse (3704131261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621314073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621314053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810657036 + 810657037.

It is an arithmetic number, because the mean of its divisors is an integer number (810657037).

Almost surely, 2^1621314073 is an apocalyptic number.

It is an amenable number.

1621314073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621314073 is an equidigital number, since it uses as much as digits as its factorization.

1621314073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1621314073 is about 40265.5444890542. The cubic root of 1621314073 is about 1174.7777634319. Note that the first 4 decimals are identical.

The spelling of 1621314073 in words is "one billion, six hundred twenty-one million, three hundred fourteen thousand, seventy-three".