1611918901 has 2 divisors, whose sum is σ = 1611918902. Its totient is φ = 1611918900.

The previous prime is 1611918887. The next prime is 1611918907. The reversal of 1611918901 is 1098191161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1363824900 + 248094001 = 36930^2 + 15751^2 .

It is an emirp because it is prime and its reverse (1098191161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1611918901 - 2⁷ = 1611918773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611918907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805959450 + 805959451.

It is an arithmetic number, because the mean of its divisors is an integer number (805959451).

Almost surely, 2^1611918901 is an apocalyptic number.

It is an amenable number.

1611918901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611918901 is an equidigital number, since it uses as much as digits as its factorization.

1611918901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 37.

The square root of 1611918901 is about 40148.7098298314. The cubic root of 1611918901 is about 1172.5041699062.

The spelling of 1611918901 in words is "one billion, six hundred eleven million, nine hundred eighteen thousand, nine hundred one".