2978327621 has 2 divisors, whose sum is σ = 2978327622. Its totient is φ = 2978327620.

The previous prime is 2978327609. The next prime is 2978327629. The reversal of 2978327621 is 1267238792.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2806350625 + 171976996 = 52975^2 + 13114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2978327621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2978327629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489163810 + 1489163811.

It is an arithmetic number, because the mean of its divisors is an integer number (1489163811).

Almost surely, 2^2978327621 is an apocalyptic number.

It is an amenable number.

2978327621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2978327621 is an equidigital number, since it uses as much as digits as its factorization.

2978327621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 2978327621 is about 54574.0562996741. The cubic root of 2978327621 is about 1438.7681757556.

The spelling of 2978327621 in words is "two billion, nine hundred seventy-eight million, three hundred twenty-seven thousand, six hundred twenty-one".