1215154461 has 8 divisors (see below), whose sum is σ = 1672470784. Its totient is φ = 783970560.

The previous prime is 1215154459. The next prime is 1215154463. The reversal of 1215154461 is 1644515121.

It is an interprime number because it is at equal distance from previous prime (1215154459) and next prime (1215154463).

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

It is not a de Polignac number, because 1215154461 - 2¹ = 1215154459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215154463) 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, 6532996 + ... + 6533181.

It is an arithmetic number, because the mean of its divisors is an integer number (209058848).

Almost surely, 2^1215154461 is an apocalyptic number.

It is an amenable number.

1215154461 is a deficient number, since it is larger than the sum of its proper divisors (457316323).

1215154461 is a wasteful number, since it uses less digits than its factorization.

1215154461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13066211.

The product of its digits is 4800, while the sum is 30.

The square root of 1215154461 is about 34859.0656931594. The cubic root of 1215154461 is about 1067.1132076447.

Adding to 1215154461 its reverse (1644515121), we get a palindrome (2859669582).

The spelling of 1215154461 in words is "one billion, two hundred fifteen million, one hundred fifty-four thousand, four hundred sixty-one".