23948491009 has 3 divisors (see below), whose sum is σ = 23948645763. Its totient is φ = 23948336256.

The previous prime is 23948491001. The next prime is 23948491031. The reversal of 23948491009 is 90019484932.

The square root of 23948491009 is 154753.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 23279130625 + 669360384 = 152575^2 + 25872^2 .

It is not a de Polignac number, because 23948491009 - 2³ = 23948491001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23948491001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 77377 + ... + 232129.

It is an arithmetic number, because the mean of its divisors is an integer number (7982881921).

Almost surely, 2^23948491009 is an apocalyptic number.

23948491009 is the 154753-rd square number.

23948491009 is the 77377-th centered octagonal number.

It is an amenable number.

23948491009 is a deficient number, since it is larger than the sum of its proper divisors (154754).

23948491009 is an frugal number, since it uses more digits than its factorization.

23948491009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309506 (or 154753 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

Multiplying 23948491009 by its sum of digits (49), we get a square (1173476059441 = 1083271²).

The spelling of 23948491009 in words is "twenty-three billion, nine hundred forty-eight million, four hundred ninety-one thousand, nine".