1215054101 has 4 divisors (see below), whose sum is σ = 1217160492. Its totient is φ = 1212947712.

The previous prime is 1215054067. The next prime is 1215054119. The reversal of 1215054101 is 1014505121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1014505121 = 7 ⋅144929303.

It can be written as a sum of positive squares in 2 ways, for example, as 625050001 + 590004100 = 25001^2 + 24290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215054101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215054901) 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, 1052330 + ... + 1053483.

It is an arithmetic number, because the mean of its divisors is an integer number (304290123).

Almost surely, 2^1215054101 is an apocalyptic number.

It is an amenable number.

1215054101 is a deficient number, since it is larger than the sum of its proper divisors (2106391).

1215054101 is an equidigital number, since it uses as much as digits as its factorization.

1215054101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106390.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1215054101 is about 34857.6261526800. The cubic root of 1215054101 is about 1067.0838290942.

Adding to 1215054101 its reverse (1014505121), we get a palindrome (2229559222).

The spelling of 1215054101 in words is "one billion, two hundred fifteen million, fifty-four thousand, one hundred one".