1798876561 has 2 divisors, whose sum is σ = 1798876562. Its totient is φ = 1798876560.

The previous prime is 1798876523. The next prime is 1798876567. The reversal of 1798876561 is 1656788971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 904866561 + 894010000 = 30081^2 + 29900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1798876561 - 2¹⁷ = 1798745489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1798876496 and 1798876505.

It is not a weakly prime, because it can be changed into another prime (1798876567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899438280 + 899438281.

It is an arithmetic number, because the mean of its divisors is an integer number (899438281).

Almost surely, 2^1798876561 is an apocalyptic number.

It is an amenable number.

1798876561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798876561 is an equidigital number, since it uses as much as digits as its factorization.

1798876561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 58.

The square root of 1798876561 is about 42413.1649491051. The cubic root of 1798876561 is about 1216.1872730042.

It can be divided in two parts, 17988 and 76561, that added together give a palindrome (94549).

The spelling of 1798876561 in words is "one billion, seven hundred ninety-eight million, eight hundred seventy-six thousand, five hundred sixty-one".