3128361997 has 4 divisors (see below), whose sum is σ = 3264377760. Its totient is φ = 2992346236.

The previous prime is 3128361991. The next prime is 3128362009. The reversal of 3128361997 is 7991638213.

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 3128361997 - 2¹⁵ = 3128329229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3128361997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128361991) 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, 68007847 + ... + 68007892.

It is an arithmetic number, because the mean of its divisors is an integer number (816094440).

Almost surely, 2^3128361997 is an apocalyptic number.

It is an amenable number.

3128361997 is a deficient number, since it is larger than the sum of its proper divisors (136015763).

3128361997 is a wasteful number, since it uses less digits than its factorization.

3128361997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136015762.

The product of its digits is 489888, while the sum is 49.

The square root of 3128361997 is about 55931.7619693855. The cubic root of 3128361997 is about 1462.5329766056.

The spelling of 3128361997 in words is "three billion, one hundred twenty-eight million, three hundred sixty-one thousand, nine hundred ninety-seven".