15461894821 has 2 divisors, whose sum is σ = 15461894822. Its totient is φ = 15461894820.

The previous prime is 15461894801. The next prime is 15461894849. The reversal of 15461894821 is 12849816451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15453970596 + 7924225 = 124314^2 + 2815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15461894821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15461894801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7730947410 + 7730947411.

It is an arithmetic number, because the mean of its divisors is an integer number (7730947411).

Almost surely, 2^15461894821 is an apocalyptic number.

It is an amenable number.

15461894821 is a deficient number, since it is larger than the sum of its proper divisors (1).

15461894821 is an equidigital number, since it uses as much as digits as its factorization.

15461894821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 49.

The spelling of 15461894821 in words is "fifteen billion, four hundred sixty-one million, eight hundred ninety-four thousand, eight hundred twenty-one".