1218246801 has 4 divisors (see below), whose sum is σ = 1624329072. Its totient is φ = 812164532.

The previous prime is 1218246779. The next prime is 1218246847. The reversal of 1218246801 is 1086428121.

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 1218246801 - 2⁶ = 1218246737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218246851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203041131 + ... + 203041136.

It is an arithmetic number, because the mean of its divisors is an integer number (406082268).

Almost surely, 2^1218246801 is an apocalyptic number.

It is an amenable number.

1218246801 is a deficient number, since it is larger than the sum of its proper divisors (406082271).

1218246801 is an equidigital number, since it uses as much as digits as its factorization.

1218246801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406082270.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1218246801 is about 34903.3923995935. The cubic root of 1218246801 is about 1068.0176418062.

The spelling of 1218246801 in words is "one billion, two hundred eighteen million, two hundred forty-six thousand, eight hundred one".