1618931141 has 4 divisors (see below), whose sum is σ = 1620475500. Its totient is φ = 1617386784.

The previous prime is 1618931113. The next prime is 1618931191. The reversal of 1618931141 is 1411398161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1365006916 + 253924225 = 36946^2 + 15935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618931141 - 2³⁰ = 545189317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618931191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770606 + ... + 772703.

It is an arithmetic number, because the mean of its divisors is an integer number (405118875).

Almost surely, 2^1618931141 is an apocalyptic number.

It is an amenable number.

1618931141 is a deficient number, since it is larger than the sum of its proper divisors (1544359).

1618931141 is a wasteful number, since it uses less digits than its factorization.

1618931141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544358.

The product of its digits is 5184, while the sum is 35.

The square root of 1618931141 is about 40235.9433964211. The cubic root of 1618931141 is about 1174.2019366634.

The spelling of 1618931141 in words is "one billion, six hundred eighteen million, nine hundred thirty-one thousand, one hundred forty-one".