1216745041 has 4 divisors (see below), whose sum is σ = 1221371712. Its totient is φ = 1212118372.

The previous prime is 1216745027. The next prime is 1216745059. The reversal of 1216745041 is 1405476121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216745041 - 2⁷ = 1216744913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216744994 and 1216745012.

It is not an unprimeable number, because it can be changed into a prime (1216745941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312941 + ... + 2313466.

It is an arithmetic number, because the mean of its divisors is an integer number (305342928).

Almost surely, 2^1216745041 is an apocalyptic number.

It is an amenable number.

1216745041 is a deficient number, since it is larger than the sum of its proper divisors (4626671).

1216745041 is an equidigital number, since it uses as much as digits as its factorization.

1216745041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626670.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1216745041 is about 34881.8726704860. The cubic root of 1216745041 is about 1067.5786049649.

The spelling of 1216745041 in words is "one billion, two hundred sixteen million, seven hundred forty-five thousand, forty-one".