55515491 has 8 divisors (see below), whose sum is σ = 58005024. Its totient is φ = 53032320.

The previous prime is 55515479. The next prime is 55515497. The reversal of 55515491 is 19451555.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55515491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55515497) 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, 28901 + ... + 30761.

It is an arithmetic number, because the mean of its divisors is an integer number (7250628).

Almost surely, 2^55515491 is an apocalyptic number.

55515491 is a deficient number, since it is larger than the sum of its proper divisors (2489533).

55515491 is a wasteful number, since it uses less digits than its factorization.

55515491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181.

The product of its digits is 22500, while the sum is 35.

The square root of 55515491 is about 7450.8718281823. The cubic root of 55515491 is about 381.4796671914.

The spelling of 55515491 in words is "fifty-five million, five hundred fifteen thousand, four hundred ninety-one".