1971763457 has 8 divisors (see below), whose sum is σ = 1992208680. Its totient is φ = 1951361280.

The previous prime is 1971763427. The next prime is 1971763459. The reversal of 1971763457 is 7543671791.

It can be written as a sum of positive squares in 4 ways, for example, as 316982416 + 1654781041 = 17804^2 + 40679^2 .

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 1971763457 - 2⁶ = 1971763393 is a prime.

It is a super-2 number, since 2×1971763457² = 7775702260721181698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971763459) 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, 85763 + ... + 106295.

It is an arithmetic number, because the mean of its divisors is an integer number (249026085).

Almost surely, 2^1971763457 is an apocalyptic number.

It is an amenable number.

1971763457 is a deficient number, since it is larger than the sum of its proper divisors (20445223).

1971763457 is a wasteful number, since it uses less digits than its factorization.

1971763457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21523.

The product of its digits is 1111320, while the sum is 50.

The square root of 1971763457 is about 44404.5432022445. The cubic root of 1971763457 is about 1253.9636226323.

The spelling of 1971763457 in words is "one billion, nine hundred seventy-one million, seven hundred sixty-three thousand, four hundred fifty-seven".