1445216509 has 16 divisors (see below), whose sum is σ = 1590462720. Its totient is φ = 1302336000.

The previous prime is 1445216491. The next prime is 1445216527. The reversal of 1445216509 is 9056125441.

It is an interprime number because it is at equal distance from previous prime (1445216491) and next prime (1445216527).

It is a cyclic number.

It is not a de Polignac number, because 1445216509 - 2¹⁵ = 1445183741 is a prime.

It is a super-2 number, since 2×1445216509² = 4177301515772294162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445216309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632449 + ... + 634729.

It is an arithmetic number, because the mean of its divisors is an integer number (99403920).

Almost surely, 2^1445216509 is an apocalyptic number.

It is an amenable number.

1445216509 is a deficient number, since it is larger than the sum of its proper divisors (145246211).

1445216509 is a wasteful number, since it uses less digits than its factorization.

1445216509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1445216509 is about 38016.0033275462. The cubic root of 1445216509 is about 1130.6051810924.

The spelling of 1445216509 in words is "one billion, four hundred forty-five million, two hundred sixteen thousand, five hundred nine".