2351220509 has 4 divisors (see below), whose sum is σ = 2564967840. Its totient is φ = 2137473180.

The previous prime is 2351220499. The next prime is 2351220527. The reversal of 2351220509 is 9050221532.

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 2351220509 - 2⁸ = 2351220253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2351220709) 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, 106873649 + ... + 106873670.

It is an arithmetic number, because the mean of its divisors is an integer number (641241960).

Almost surely, 2^2351220509 is an apocalyptic number.

It is an amenable number.

2351220509 is a deficient number, since it is larger than the sum of its proper divisors (213747331).

2351220509 is a wasteful number, since it uses less digits than its factorization.

2351220509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213747330.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 2351220509 is about 48489.3855292063. The cubic root of 2351220509 is about 1329.7330213921.

The spelling of 2351220509 in words is "two billion, three hundred fifty-one million, two hundred twenty thousand, five hundred nine".