19121745 has 16 divisors (see below), whose sum is σ = 30768192. Its totient is φ = 10140480.

The previous prime is 19121743. The next prime is 19121749. The reversal of 19121745 is 54712191.

It is not a de Polignac number, because 19121745 - 2¹ = 19121743 is a prime.

It is a super-2 number, since 2×19121745² = 731282263690050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19121743) 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 15 ways as a sum of consecutive naturals, for example, 807 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (1923012).

Almost surely, 2^19121745 is an apocalyptic number.

19121745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19121745 is a deficient number, since it is larger than the sum of its proper divisors (11646447).

19121745 is a wasteful number, since it uses less digits than its factorization.

19121745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232.

The product of its digits is 2520, while the sum is 30.

The square root of 19121745 is about 4372.8417533682. The cubic root of 19121745 is about 267.4088896923.

The spelling of 19121745 in words is "nineteen million, one hundred twenty-one thousand, seven hundred forty-five".