1232656981 has 2 divisors, whose sum is σ = 1232656982. Its totient is φ = 1232656980.

The previous prime is 1232656967. The next prime is 1232656991. The reversal of 1232656981 is 1896562321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677300625 + 555356356 = 26025^2 + 23566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232656981 - 2⁵ = 1232656949 is a prime.

It is a super-2 number, since 2×1232656981² = 3038886465616068722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232656991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616328490 + 616328491.

It is an arithmetic number, because the mean of its divisors is an integer number (616328491).

Almost surely, 2^1232656981 is an apocalyptic number.

It is an amenable number.

1232656981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232656981 is an equidigital number, since it uses as much as digits as its factorization.

1232656981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 1232656981 is about 35109.2150439169. The cubic root of 1232656981 is about 1072.2122051156.

The spelling of 1232656981 in words is "one billion, two hundred thirty-two million, six hundred fifty-six thousand, nine hundred eighty-one".