1611461691 has 12 divisors (see below), whose sum is σ = 2660190832. Its totient is φ = 920835216.

The previous prime is 1611461639. The next prime is 1611461707. The reversal of 1611461691 is 1961641161.

It is not a de Polignac number, because 1611461691 - 2¹¹ = 1611459643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611461191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12789316 + ... + 12789441.

Almost surely, 2^1611461691 is an apocalyptic number.

1611461691 is a deficient number, since it is larger than the sum of its proper divisors (1048729141).

1611461691 is a wasteful number, since it uses less digits than its factorization.

1611461691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25578770 (or 25578767 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1611461691 is about 40143.0154696929. The cubic root of 1611461691 is about 1172.3933017717.

The spelling of 1611461691 in words is "one billion, six hundred eleven million, four hundred sixty-one thousand, six hundred ninety-one".