30901621 has 2 divisors, whose sum is σ = 30901622. Its totient is φ = 30901620.

The previous prime is 30901613. The next prime is 30901639. The reversal of 30901621 is 12610903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15800625 + 15100996 = 3975^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 30901621 - 2³ = 30901613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30901592 and 30901601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30901681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15450810 + 15450811.

It is an arithmetic number, because the mean of its divisors is an integer number (15450811).

Almost surely, 2^30901621 is an apocalyptic number.

It is an amenable number.

30901621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30901621 is an equidigital number, since it uses as much as digits as its factorization.

30901621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 30901621 is about 5558.9226474201. The cubic root of 30901621 is about 313.8054056848.

The spelling of 30901621 in words is "thirty million, nine hundred one thousand, six hundred twenty-one".