19121613 has 12 divisors (see below), whose sum is σ = 29658240. Its totient is φ = 10926552.

The previous prime is 19121593. The next prime is 19121629. The reversal of 19121613 is 31612191.

It is not a de Polignac number, because 19121613 - 2⁸ = 19121357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121653) 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 11 ways as a sum of consecutive naturals, for example, 64893 + ... + 65186.

It is an arithmetic number, because the mean of its divisors is an integer number (2471520).

Almost surely, 2^19121613 is an apocalyptic number.

It is an amenable number.

19121613 is a deficient number, since it is larger than the sum of its proper divisors (10536627).

19121613 is a wasteful number, since it uses less digits than its factorization.

19121613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130096 (or 130089 counting only the distinct ones).

The product of its digits is 324, while the sum is 24.

The square root of 19121613 is about 4372.8266601822. The cubic root of 19121613 is about 267.4082743709.

The spelling of 19121613 in words is "nineteen million, one hundred twenty-one thousand, six hundred thirteen".