19490104251 has 40 divisors (see below), whose sum is σ = 30412720800. Its totient is φ = 12415379328.

The previous prime is 19490104241. The next prime is 19490104261. The reversal of 19490104251 is 15240109491.

It is a happy number.

19490104251 is a `hidden beast` number, since 19 + 490 + 104 + 2 + 51 = 666.

It is an interprime number because it is at equal distance from previous prime (19490104241) and next prime (19490104261).

It is not a de Polignac number, because 19490104251 - 2⁹ = 19490103739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19490104241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1949301 + ... + 1959273.

It is an arithmetic number, because the mean of its divisors is an integer number (760318020).

Almost surely, 2^19490104251 is an apocalyptic number.

19490104251 is a deficient number, since it is larger than the sum of its proper divisors (10922616549).

19490104251 is a wasteful number, since it uses less digits than its factorization.

19490104251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11057 (or 11048 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 19490104251 in words is "nineteen billion, four hundred ninety million, one hundred four thousand, two hundred fifty-one".