1611231993 has 20 divisors (see below), whose sum is σ = 2750746240. Its totient is φ = 920703672.

The previous prime is 1611231971. The next prime is 1611231997. The reversal of 1611231993 is 3991321161.

1611231993 is a `hidden beast` number, since 1 + 611 + 2 + 31 + 9 + 9 + 3 = 666.

It is not a de Polignac number, because 1611231993 - 2⁸ = 1611231737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611231997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1420273 + ... + 1421406.

It is an arithmetic number, because the mean of its divisors is an integer number (137537312).

Almost surely, 2^1611231993 is an apocalyptic number.

It is an amenable number.

1611231993 is a deficient number, since it is larger than the sum of its proper divisors (1139514247).

1611231993 is an equidigital number, since it uses as much as digits as its factorization.

1611231993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841698 (or 2841689 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 1611231993 is about 40140.1543719005. The cubic root of 1611231993 is about 1172.3375947502.

The spelling of 1611231993 in words is "one billion, six hundred eleven million, two hundred thirty-one thousand, nine hundred ninety-three".