1553479481 has 2 divisors, whose sum is σ = 1553479482. Its totient is φ = 1553479480.

The previous prime is 1553479457. The next prime is 1553479483. The reversal of 1553479481 is 1849743551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1212153856 + 341325625 = 34816^2 + 18475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553479481 - 2¹⁰ = 1553478457 is a prime.

It is a super-2 number, since 2×1553479481² = 4826596995776058722, which contains 22 as substring.

Together with 1553479483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1553479483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776739740 + 776739741.

It is an arithmetic number, because the mean of its divisors is an integer number (776739741).

Almost surely, 2^1553479481 is an apocalyptic number.

It is an amenable number.

1553479481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553479481 is an equidigital number, since it uses as much as digits as its factorization.

1553479481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 1553479481 is about 39414.2040513315. The cubic root of 1553479481 is about 1158.1598552043.

The spelling of 1553479481 in words is "one billion, five hundred fifty-three million, four hundred seventy-nine thousand, four hundred eighty-one".