1611878413 has 2 divisors, whose sum is σ = 1611878414. Its totient is φ = 1611878412.

The previous prime is 1611878381. The next prime is 1611878419. The reversal of 1611878413 is 3148781161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927689764 + 684188649 = 30458^2 + 26157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611878413 - 2⁵ = 1611878381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611878419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805939206 + 805939207.

It is an arithmetic number, because the mean of its divisors is an integer number (805939207).

Almost surely, 2^1611878413 is an apocalyptic number.

It is an amenable number.

1611878413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611878413 is an equidigital number, since it uses as much as digits as its factorization.

1611878413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 1611878413 is about 40148.2056012470. The cubic root of 1611878413 is about 1172.4943528808.

The spelling of 1611878413 in words is "one billion, six hundred eleven million, eight hundred seventy-eight thousand, four hundred thirteen".