13915551 has 16 divisors (see below), whose sum is σ = 20049120. Its totient is φ = 8534400.

The previous prime is 13915549. The next prime is 13915553. The reversal of 13915551 is 15551931.

It is an interprime number because it is at equal distance from previous prime (13915549) and next prime (13915553).

It is not a de Polignac number, because 13915551 - 2¹ = 13915549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13915553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19501 + ... + 20201.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^13915551 is an apocalyptic number.

13915551 is a deficient number, since it is larger than the sum of its proper divisors (6133569).

13915551 is a wasteful number, since it uses less digits than its factorization.

13915551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its digits is 3375, while the sum is 30.

The square root of 13915551 is about 3730.3553450040. The cubic root of 13915551 is about 240.5286437386.

The spelling of 13915551 in words is "thirteen million, nine hundred fifteen thousand, five hundred fifty-one".