1264544987 has 2 divisors, whose sum is σ = 1264544988. Its totient is φ = 1264544986.

The previous prime is 1264544977. The next prime is 1264545077. The reversal of 1264544987 is 7894454621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1264544987 - 2²⁰ = 1263496411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264544927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632272493 + 632272494.

It is an arithmetic number, because the mean of its divisors is an integer number (632272494).

Almost surely, 2^1264544987 is an apocalyptic number.

1264544987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264544987 is an equidigital number, since it uses as much as digits as its factorization.

1264544987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The square root of 1264544987 is about 35560.4413217834. The cubic root of 1264544987 is about 1081.3794065572.

The spelling of 1264544987 in words is "one billion, two hundred sixty-four million, five hundred forty-four thousand, nine hundred eighty-seven".