1218253601 has 8 divisors (see below), whose sum is σ = 1274788584. Its totient is φ = 1162961280.

The previous prime is 1218253591. The next prime is 1218253613. The reversal of 1218253601 is 1063528121.

It can be written as a sum of positive squares in 4 ways, for example, as 834054400 + 384199201 = 28880^2 + 19601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1218253601 - 2²⁶ = 1151144737 is a prime.

It is a super-3 number, since 3×1218253601³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218253681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308660 + ... + 312581.

It is an arithmetic number, because the mean of its divisors is an integer number (159348573).

Almost surely, 2^1218253601 is an apocalyptic number.

It is an amenable number.

1218253601 is a deficient number, since it is larger than the sum of its proper divisors (56534983).

1218253601 is an equidigital number, since it uses as much as digits as its factorization.

1218253601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621331.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1218253601 is about 34903.4898111922. The cubic root of 1218253601 is about 1068.0196289532.

The spelling of 1218253601 in words is "one billion, two hundred eighteen million, two hundred fifty-three thousand, six hundred one".