1287373545 has 24 divisors (see below), whose sum is σ = 2232290112. Its totient is φ = 686340000.

The previous prime is 1287373543. The next prime is 1287373547. The reversal of 1287373545 is 5453737821.

It is an interprime number because it is at equal distance from previous prime (1287373543) and next prime (1287373547).

It is not a de Polignac number, because 1287373545 - 2¹ = 1287373543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1287373545.

It is not an unprimeable number, because it can be changed into a prime (1287373543) 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 in 23 ways as a sum of consecutive naturals, for example, 206220 + ... + 212370.

It is an arithmetic number, because the mean of its divisors is an integer number (93012088).

Almost surely, 2^1287373545 is an apocalyptic number.

1287373545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287373545 is a deficient number, since it is larger than the sum of its proper divisors (944916567).

1287373545 is a wasteful number, since it uses less digits than its factorization.

1287373545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10813 (or 10810 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The square root of 1287373545 is about 35879.9880852823. The cubic root of 1287373545 is about 1087.8479394002.

The spelling of 1287373545 in words is "one billion, two hundred eighty-seven million, three hundred seventy-three thousand, five hundred forty-five".