1239234277681 has 9 divisors (see below), whose sum is σ = 1257014284473. Its totient is φ = 1221702349140.

The previous prime is 1239234277667. The next prime is 1239234277691. The reversal of 1239234277681 is 1867724329321.

The square root of 1239234277681 is 1113209.

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

It is not a de Polignac number, because 1239234277681 - 2¹³ = 1239234269489 is a prime.

It is a super-2 number, since 2×1239234277681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1239234277651) 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, 79030000 + ... + 79045678.

Almost surely, 2^{1239234277681} is an apocalyptic number.

1239234277681 is the 1113209-th square number.

1239234277681 is the 556605-th centered octagonal number.

It is an amenable number.

1239234277681 is a deficient number, since it is larger than the sum of its proper divisors (17780006792).

1239234277681 is an frugal number, since it uses more digits than its factorization.

1239234277681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31500 (or 15750 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 55.

It can be divided in two parts, 123923 and 4277681, that added together give a square (4401604 = 2098²).

The spelling of 1239234277681 in words is "one trillion, two hundred thirty-nine billion, two hundred thirty-four million, two hundred seventy-seven thousand, six hundred eighty-one".