1997772313 has 8 divisors (see below), whose sum is σ = 2016638568. Its totient is φ = 1978927104.

The previous prime is 1997772269. The next prime is 1997772349. The reversal of 1997772313 is 3132777991.

It can be written as a sum of positive squares in 4 ways, for example, as 13337104 + 1984435209 = 3652^2 + 44547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1997772313 - 2²⁹ = 1460901401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997772353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237345 + ... + 245617.

It is an arithmetic number, because the mean of its divisors is an integer number (252079821).

Almost surely, 2^1997772313 is an apocalyptic number.

It is an amenable number.

1997772313 is a deficient number, since it is larger than the sum of its proper divisors (18866255).

1997772313 is a wasteful number, since it uses less digits than its factorization.

1997772313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523.

The product of its digits is 500094, while the sum is 49.

The square root of 1997772313 is about 44696.4463128782. The cubic root of 1997772313 is about 1259.4530911503.

The spelling of 1997772313 in words is "one billion, nine hundred ninety-seven million, seven hundred seventy-two thousand, three hundred thirteen".