1816001131 has 4 divisors (see below), whose sum is σ = 2075429872.
Its totient is φ = 1556572392.
The previous prime is 1816001113. The next prime is 1816001147. The reversal of 1816001131 is 1311006181.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 1816001131 - 217 = 1815870059 is a prime.
It is a super-2 number, since 2×18160011312 = 6595720215586558322, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1816001101) 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, 129714360 + ... + 129714373.
It is an arithmetic number, because the mean of its divisors is an integer number (518857468).
Almost surely, 21816001131 is an apocalyptic number.
1816001131 is a deficient number, since it is larger than the sum of its proper divisors (259428741).
1816001131 is an equidigital number, since it uses as much as digits as its factorization.
1816001131 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 259428740.
The product of its (nonzero) digits is 144, while the sum is 22.
The square root of 1816001131 is about 42614.5647754380.
The cubic root of 1816001131 is about 1220.0342933566.
The spelling of 1816001131 in words is "one billion, eight hundred sixteen million, one thousand, one hundred thirty-one".