18261901 has 8 divisors (see below), whose sum is σ = 20922624. Its totient is φ = 15614160.

The previous prime is 18261889. The next prime is 18261913. The reversal of 18261901 is 10916281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18261889) and next prime (18261913).

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 18261901 - 2⁷ = 18261773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18261901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (2615328).

Almost surely, 2^18261901 is an apocalyptic number.

It is an amenable number.

18261901 is a deficient number, since it is larger than the sum of its proper divisors (2660723).

18261901 is an equidigital number, since it uses as much as digits as its factorization.

18261901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6491.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 18261901 is about 4273.3945523436. The cubic root of 18261901 is about 263.3390885174.

The spelling of 18261901 in words is "eighteen million, two hundred sixty-one thousand, nine hundred one".