1421968681 has 9 divisors (see below), whose sum is σ = 1654433949. Its totient is φ = 1218604044.

The previous prime is 1421968651. The next prime is 1421968693. The reversal of 1421968681 is 1868691241.

The square root of 1421968681 is 37709.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1421968681 - 2⁵ = 1421968649 is a prime.

It is a super-2 number, since 2×1421968681² = 4043989859489759522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1421968631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261270 + ... + 266656.

Almost surely, 2^1421968681 is an apocalyptic number.

1421968681 is the 37709-th square number.

1421968681 is the 18855-th centered octagonal number.

It is an amenable number.

1421968681 is a deficient number, since it is larger than the sum of its proper divisors (232465268).

1421968681 is an frugal number, since it uses more digits than its factorization.

1421968681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10788 (or 5394 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The cubic root of 1421968681 is about 1124.5100565510.

The spelling of 1421968681 in words is "one billion, four hundred twenty-one million, nine hundred sixty-eight thousand, six hundred eighty-one".