4921972987 has 2 divisors, whose sum is σ = 4921972988. Its totient is φ = 4921972986.

The previous prime is 4921972981. The next prime is 4921972997. The reversal of 4921972987 is 7892791294.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4921972987 is a prime.

It is not a weakly prime, because it can be changed into another prime (4921972981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460986493 + 2460986494.

It is an arithmetic number, because the mean of its divisors is an integer number (2460986494).

Almost surely, 2^4921972987 is an apocalyptic number.

4921972987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921972987 is an equidigital number, since it uses as much as digits as its factorization.

4921972987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 4921972987 is about 70156.7743485973. The cubic root of 4921972987 is about 1701.0343171687.

The spelling of 4921972987 in words is "four billion, nine hundred twenty-one million, nine hundred seventy-two thousand, nine hundred eighty-seven".