1801642613 has 2 divisors, whose sum is σ = 1801642614. Its totient is φ = 1801642612.

The previous prime is 1801642573. The next prime is 1801642627. The reversal of 1801642613 is 3162461081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569902884 + 231739729 = 39622^2 + 15223^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801642613 - 2²² = 1797448309 is a prime.

It is a super-2 number, since 2×1801642613² = 6491832209954935538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1801642613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801644613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900821306 + 900821307.

It is an arithmetic number, because the mean of its divisors is an integer number (900821307).

Almost surely, 2^1801642613 is an apocalyptic number.

It is an amenable number.

1801642613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801642613 is an equidigital number, since it uses as much as digits as its factorization.

1801642613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1801642613 is about 42445.7608366254. The cubic root of 1801642613 is about 1216.8103126909.

The spelling of 1801642613 in words is "one billion, eight hundred one million, six hundred forty-two thousand, six hundred thirteen".