1611377813 has 2 divisors, whose sum is σ = 1611377814. Its totient is φ = 1611377812.

The previous prime is 1611377717. The next prime is 1611377857. The reversal of 1611377813 is 3187731161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1443468049 + 167909764 = 37993^2 + 12958^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611377813 - 2¹⁸ = 1611115669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611377513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805688906 + 805688907.

It is an arithmetic number, because the mean of its divisors is an integer number (805688907).

Almost surely, 2^1611377813 is an apocalyptic number.

It is an amenable number.

1611377813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611377813 is an equidigital number, since it uses as much as digits as its factorization.

1611377813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 1611377813 is about 40141.9707164459. The cubic root of 1611377813 is about 1172.3729600508.

The spelling of 1611377813 in words is "one billion, six hundred eleven million, three hundred seventy-seven thousand, eight hundred thirteen".