264001987 has 2 divisors, whose sum is σ = 264001988. Its totient is φ = 264001986.

The previous prime is 264001951. The next prime is 264001999. The reversal of 264001987 is 789100462.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264001987 is a prime.

It is not a weakly prime, because it can be changed into another prime (264001187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132000993 + 132000994.

It is an arithmetic number, because the mean of its divisors is an integer number (132000994).

Almost surely, 2^264001987 is an apocalyptic number.

264001987 is a deficient number, since it is larger than the sum of its proper divisors (1).

264001987 is an equidigital number, since it uses as much as digits as its factorization.

264001987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 264001987 is about 16248.1379548550. The cubic root of 264001987 is about 641.5084754322.

The spelling of 264001987 in words is "two hundred sixty-four million, one thousand, nine hundred eighty-seven".