19800151 has 4 divisors (see below), whose sum is σ = 22628752. Its totient is φ = 16971552.

The previous prime is 19800139. The next prime is 19800161. The reversal of 19800151 is 15100891.

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 19800151 - 2⁵ = 19800119 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 (19800101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414290 + ... + 1414303.

It is an arithmetic number, because the mean of its divisors is an integer number (5657188).

Almost surely, 2^19800151 is an apocalyptic number.

19800151 is a deficient number, since it is larger than the sum of its proper divisors (2828601).

19800151 is an equidigital number, since it uses as much as digits as its factorization.

19800151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828600.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 19800151 is about 4449.7360595883. The cubic root of 19800151 is about 270.5346106187.

Subtracting from 19800151 its product of nonzero digits (360), we obtain a palindrome (19799791).

The spelling of 19800151 in words is "nineteen million, eight hundred thousand, one hundred fifty-one".