987972019 has 2 divisors, whose sum is σ = 987972020. Its totient is φ = 987972018.

The previous prime is 987971987. The next prime is 987972023. The reversal of 987972019 is 910279789.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 987972019 - 2⁵ = 987971987 is a prime.

It is a super-2 number, since 2×987972019² = 1952177420653872722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (987972059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493986009 + 493986010.

It is an arithmetic number, because the mean of its divisors is an integer number (493986010).

Almost surely, 2^987972019 is an apocalyptic number.

987972019 is a deficient number, since it is larger than the sum of its proper divisors (1).

987972019 is an equidigital number, since it uses as much as digits as its factorization.

987972019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 987972019 is about 31432.0221907532. The cubic root of 987972019 is about 995.9744900134.

The spelling of 987972019 in words is "nine hundred eighty-seven million, nine hundred seventy-two thousand, nineteen".