19120987 has 2 divisors, whose sum is σ = 19120988. Its totient is φ = 19120986.

The previous prime is 19120967. The next prime is 19121029. The reversal of 19120987 is 78902191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19120987 is a prime.

It is a super-2 number, since 2×19120987² = 731224287708338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19120957) 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 as a sum of consecutive naturals, namely, 9560493 + 9560494.

It is an arithmetic number, because the mean of its divisors is an integer number (9560494).

Almost surely, 2^19120987 is an apocalyptic number.

19120987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19120987 is an equidigital number, since it uses as much as digits as its factorization.

19120987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19120987 is about 4372.7550811817. The cubic root of 19120987 is about 267.4053562174.

The spelling of 19120987 in words is "nineteen million, one hundred twenty thousand, nine hundred eighty-seven".