53185391849 has 2 divisors, whose sum is σ = 53185391850. Its totient is φ = 53185391848.

The previous prime is 53185391711. The next prime is 53185391863. The reversal of 53185391849 is 94819358135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47244065449 + 5941326400 = 217357^2 + 77080^2 .

It is a cyclic number.

It is not a de Polignac number, because 53185391849 - 2¹² = 53185387753 is a prime.

It is a super-2 number, since 2×53185391849² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53185391794 and 53185391803.

It is not a weakly prime, because it can be changed into another prime (53185391879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26592695924 + 26592695925.

It is an arithmetic number, because the mean of its divisors is an integer number (26592695925).

Almost surely, 2^53185391849 is an apocalyptic number.

It is an amenable number.

53185391849 is a deficient number, since it is larger than the sum of its proper divisors (1).

53185391849 is an equidigital number, since it uses as much as digits as its factorization.

53185391849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 56.

The spelling of 53185391849 in words is "fifty-three billion, one hundred eighty-five million, three hundred ninety-one thousand, eight hundred forty-nine".