18119531 has 8 divisors (see below), whose sum is σ = 18754944. Its totient is φ = 17487360.

The previous prime is 18119513. The next prime is 18119533. The reversal of 18119531 is 13591181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18119531 - 2¹⁸ = 17857387 is a prime.

It is a super-2 number, since 2×18119531² = 656634807319922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18119494 and 18119503.

It is not an unprimeable number, because it can be changed into a prime (18119533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17381 + ... + 18393.

It is an arithmetic number, because the mean of its divisors is an integer number (2344368).

Almost surely, 2^18119531 is an apocalyptic number.

18119531 is a deficient number, since it is larger than the sum of its proper divisors (635413).

18119531 is a wasteful number, since it uses less digits than its factorization.

18119531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its digits is 1080, while the sum is 29.

The square root of 18119531 is about 4256.7042415465. The cubic root of 18119531 is about 262.6529708546.

The spelling of 18119531 in words is "eighteen million, one hundred nineteen thousand, five hundred thirty-one".