1618942791 has 16 divisors (see below), whose sum is σ = 2325104640. Its totient is φ = 999065760.

The previous prime is 1618942789. The next prime is 1618942799. The reversal of 1618942791 is 1972498161.

It is not a de Polignac number, because 1618942791 - 2¹ = 1618942789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1618942791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618942799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376296 + ... + 380573.

It is an arithmetic number, because the mean of its divisors is an integer number (145319040).

Almost surely, 2^1618942791 is an apocalyptic number.

1618942791 is a deficient number, since it is larger than the sum of its proper divisors (706161849).

1618942791 is a wasteful number, since it uses less digits than its factorization.

1618942791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756926.

The product of its digits is 217728, while the sum is 48.

The square root of 1618942791 is about 40236.0881672163. The cubic root of 1618942791 is about 1174.2047532172.

The spelling of 1618942791 in words is "one billion, six hundred eighteen million, nine hundred forty-two thousand, seven hundred ninety-one".