30621251261 has 2 divisors, whose sum is σ = 30621251262. Its totient is φ = 30621251260.

The previous prime is 30621251251. The next prime is 30621251279. The reversal of 30621251261 is 16215212603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22389136900 + 8232114361 = 149630^2 + 90731^2 .

It is a cyclic number.

It is not a de Polignac number, because 30621251261 - 2³⁰ = 29547509437 is a prime.

It is a super-2 number, since 2×30621251261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30621251251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15310625630 + 15310625631.

It is an arithmetic number, because the mean of its divisors is an integer number (15310625631).

Almost surely, 2^30621251261 is an apocalyptic number.

It is an amenable number.

30621251261 is a deficient number, since it is larger than the sum of its proper divisors (1).

30621251261 is an equidigital number, since it uses as much as digits as its factorization.

30621251261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 30621251261 its reverse (16215212603), we get a palindrome (46836463864).

The spelling of 30621251261 in words is "thirty billion, six hundred twenty-one million, two hundred fifty-one thousand, two hundred sixty-one".