1971305797 has 8 divisors (see below), whose sum is σ = 2036017944. Its totient is φ = 1907612928.

The previous prime is 1971305783. The next prime is 1971305801. The reversal of 1971305797 is 7975031791.

It can be written as a sum of positive squares in 4 ways, for example, as 163865601 + 1807440196 = 12801^2 + 42514^2 .

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 1971305797 - 2¹⁹ = 1970781509 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 1971305797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971305197) 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, 250888 + ... + 258625.

It is an arithmetic number, because the mean of its divisors is an integer number (254502243).

Almost surely, 2^1971305797 is an apocalyptic number.

It is an amenable number.

1971305797 is a deficient number, since it is larger than the sum of its proper divisors (64712147).

1971305797 is an equidigital number, since it uses as much as digits as its factorization.

1971305797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509639.

The product of its (nonzero) digits is 416745, while the sum is 49.

The square root of 1971305797 is about 44399.3896016601. The cubic root of 1971305797 is about 1253.8665972350.

The spelling of 1971305797 in words is "one billion, nine hundred seventy-one million, three hundred five thousand, seven hundred ninety-seven".