1232561645 has 16 divisors (see below), whose sum is σ = 1705883520. Its totient is φ = 837428544.

The previous prime is 1232561621. The next prime is 1232561647. The reversal of 1232561645 is 5461652321.

It is a cyclic number.

It is not a de Polignac number, because 1232561645 - 2¹² = 1232557549 is a prime.

It is a super-3 number, since 3×1232561645³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232561647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157727 + ... + 165356.

It is an arithmetic number, because the mean of its divisors is an integer number (106617720).

Almost surely, 2^1232561645 is an apocalyptic number.

It is an amenable number.

1232561645 is a deficient number, since it is larger than the sum of its proper divisors (473321875).

1232561645 is a wasteful number, since it uses less digits than its factorization.

1232561645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323204.

The product of its digits is 43200, while the sum is 35.

The square root of 1232561645 is about 35107.8573114339. The cubic root of 1232561645 is about 1072.1845621028.

The spelling of 1232561645 in words is "one billion, two hundred thirty-two million, five hundred sixty-one thousand, six hundred forty-five".