3099781397 has 4 divisors (see below), whose sum is σ = 3099909216. Its totient is φ = 3099653580.

The previous prime is 3099781393. The next prime is 3099781417. The reversal of 3099781397 is 7931879903.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3099781397 - 2² = 3099781393 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 (3099781393) 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, 15113 + ... + 80174.

It is an arithmetic number, because the mean of its divisors is an integer number (774977304).

Almost surely, 2^3099781397 is an apocalyptic number.

It is an amenable number.

3099781397 is a deficient number, since it is larger than the sum of its proper divisors (127819).

3099781397 is an equidigital number, since it uses as much as digits as its factorization.

3099781397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127818.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The square root of 3099781397 is about 55675.6804807988. The cubic root of 3099781397 is about 1458.0654613677.

The spelling of 3099781397 in words is "three billion, ninety-nine million, seven hundred eighty-one thousand, three hundred ninety-seven".