1215514440151 has 4 divisors (see below), whose sum is σ = 1326015752904. Its totient is φ = 1105013127400.

The previous prime is 1215514440139. The next prime is 1215514440163. The reversal of 1215514440151 is 1510444155121.

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 (1215514440139) and next prime (1215514440163).

It is a cyclic number.

It is not a de Polignac number, because 1215514440151 - 2²¹ = 1215512342999 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 (1215514440181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55250656360 + ... + 55250656381.

It is an arithmetic number, because the mean of its divisors is an integer number (331503938226).

Almost surely, 2^{1215514440151} is an apocalyptic number.

1215514440151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1215514440151 is a deficient number, since it is larger than the sum of its proper divisors (110501312753).

1215514440151 is a wasteful number, since it uses less digits than its factorization.

1215514440151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110501312752.

The product of its (nonzero) digits is 16000, while the sum is 34.

Adding to 1215514440151 its reverse (1510444155121), we get a palindrome (2725958595272).

The spelling of 1215514440151 in words is "one trillion, two hundred fifteen billion, five hundred fourteen million, four hundred forty thousand, one hundred fifty-one".