1611581201 has 2 divisors, whose sum is σ = 1611581202. Its totient is φ = 1611581200.

The previous prime is 1611581141. The next prime is 1611581233. The reversal of 1611581201 is 1021851161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1519440400 + 92140801 = 38980^2 + 9599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611581201 - 2¹⁴ = 1611564817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1611581801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805790600 + 805790601.

It is an arithmetic number, because the mean of its divisors is an integer number (805790601).

Almost surely, 2^1611581201 is an apocalyptic number.

It is an amenable number.

1611581201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611581201 is an equidigital number, since it uses as much as digits as its factorization.

1611581201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 26.

The square root of 1611581201 is about 40144.5039949431. The cubic root of 1611581201 is about 1172.4222835879.

The spelling of 1611581201 in words is "one billion, six hundred eleven million, five hundred eighty-one thousand, two hundred one".