15473435981 has 2 divisors, whose sum is σ = 15473435982. Its totient is φ = 15473435980.

The previous prime is 15473435977. The next prime is 15473436029. The reversal of 15473435981 is 18953437451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15403043881 + 70392100 = 124109^2 + 8390^2 .

It is a cyclic number.

It is not a de Polignac number, because 15473435981 - 2² = 15473435977 is a prime.

It is a super-2 number, since 2×15473435981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15473435911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7736717990 + 7736717991.

It is an arithmetic number, because the mean of its divisors is an integer number (7736717991).

Almost surely, 2^15473435981 is an apocalyptic number.

It is an amenable number.

15473435981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15473435981 is an equidigital number, since it uses as much as digits as its factorization.

15473435981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The spelling of 15473435981 in words is "fifteen billion, four hundred seventy-three million, four hundred thirty-five thousand, nine hundred eighty-one".