1913762681 has 2 divisors, whose sum is σ = 1913762682. Its totient is φ = 1913762680.

The previous prime is 1913762629. The next prime is 1913762701. The reversal of 1913762681 is 1862673191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1834837225 + 78925456 = 42835^2 + 8884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913762681 is a prime.

It is a super-2 number, since 2×1913762681² = 7324975198376615522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1913762611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956881340 + 956881341.

It is an arithmetic number, because the mean of its divisors is an integer number (956881341).

Almost surely, 2^1913762681 is an apocalyptic number.

It is an amenable number.

1913762681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913762681 is an equidigital number, since it uses as much as digits as its factorization.

1913762681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1913762681 is about 43746.5733629504. The cubic root of 1913762681 is about 1241.5456534127.

It can be divided in two parts, 19137 and 62681, that added together give a palindrome (81818).

The spelling of 1913762681 in words is "one billion, nine hundred thirteen million, seven hundred sixty-two thousand, six hundred eighty-one".