1023909849217 has 4 divisors (see below), whose sum is σ = 1023961532080. Its totient is φ = 1023858166356.

The previous prime is 1023909849211. The next prime is 1023909849223. The reversal of 1023909849217 is 7129489093201.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (1023909849211) and next prime (1023909849223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023909849217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023909849211) 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, 25811703 + ... + 25851340.

It is an arithmetic number, because the mean of its divisors is an integer number (255990383020).

Almost surely, 2^{1023909849217} is an apocalyptic number.

It is an amenable number.

1023909849217 is a deficient number, since it is larger than the sum of its proper divisors (51682863).

1023909849217 is an equidigital number, since it uses as much as digits as its factorization.

1023909849217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51682862.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 1023909849217 in words is "one trillion, twenty-three billion, nine hundred nine million, eight hundred forty-nine thousand, two hundred seventeen".