1445213641 has 4 divisors (see below), whose sum is σ = 1451260800. Its totient is φ = 1439166484.

The previous prime is 1445213621. The next prime is 1445213659. The reversal of 1445213641 is 1463125441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1445213641 - 2¹³ = 1445205449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1445213611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023221 + ... + 3023698.

It is an arithmetic number, because the mean of its divisors is an integer number (362815200).

Almost surely, 2^1445213641 is an apocalyptic number.

It is an amenable number.

1445213641 is a deficient number, since it is larger than the sum of its proper divisors (6047159).

1445213641 is an equidigital number, since it uses as much as digits as its factorization.

1445213641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6047158.

The product of its digits is 11520, while the sum is 31.

The square root of 1445213641 is about 38015.9656065711. The cubic root of 1445213641 is about 1130.6044332050.

The spelling of 1445213641 in words is "one billion, four hundred forty-five million, two hundred thirteen thousand, six hundred forty-one".