1215420455 has 4 divisors (see below), whose sum is σ = 1458504552. Its totient is φ = 972336360.

The previous prime is 1215420449. The next prime is 1215420461. The reversal of 1215420455 is 5540245121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1215420449) and next prime (1215420461).

It is not a de Polignac number, because 1215420455 - 2⁴ = 1215420439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121542041 + ... + 121542050.

It is an arithmetic number, because the mean of its divisors is an integer number (364626138).

Almost surely, 2^1215420455 is an apocalyptic number.

1215420455 is a deficient number, since it is larger than the sum of its proper divisors (243084097).

1215420455 is an equidigital number, since it uses as much as digits as its factorization.

1215420455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243084096.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 1215420455 is about 34862.8807616353. The cubic root of 1215420455 is about 1067.1910646884.

Adding to 1215420455 its reverse (5540245121), we get a palindrome (6755665576).

The spelling of 1215420455 in words is "one billion, two hundred fifteen million, four hundred twenty thousand, four hundred fifty-five".