1418201561 has 12 divisors (see below), whose sum is σ = 1668286260. Its totient is φ = 1201939200.

The previous prime is 1418201539. The next prime is 1418201569. The reversal of 1418201561 is 1651028141.

It can be written as a sum of positive squares in 2 ways, for example, as 460917961 + 957283600 = 21469^2 + 30940^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1418201561 is a prime.

It is a super-2 number, since 2×1418201561² = 4022591335245673442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1418201569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158240 + ... + 166961.

It is an arithmetic number, because the mean of its divisors is an integer number (139023855).

Almost surely, 2^1418201561 is an apocalyptic number.

It is an amenable number.

1418201561 is a deficient number, since it is larger than the sum of its proper divisors (250084699).

1418201561 is an equidigital number, since it uses as much as digits as its factorization.

1418201561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325304 (or 325297 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1418201561 is about 37659.0169946057. The cubic root of 1418201561 is about 1123.5161502969.

The spelling of 1418201561 in words is "one billion, four hundred eighteen million, two hundred one thousand, five hundred sixty-one".