55098991 has 8 divisors (see below), whose sum is σ = 56224304. Its totient is φ = 53982720.

The previous prime is 55098983. The next prime is 55099021. The reversal of 55098991 is 19989055.

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

It is a cyclic number.

It is not a de Polignac number, because 55098991 - 2³ = 55098983 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 (55098971) 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, 10801 + ... + 15061.

It is an arithmetic number, because the mean of its divisors is an integer number (7028038).

Almost surely, 2^55098991 is an apocalyptic number.

55098991 is a deficient number, since it is larger than the sum of its proper divisors (1125313).

55098991 is a wasteful number, since it uses less digits than its factorization.

55098991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 55098991 is about 7422.8694586393. The cubic root of 55098991 is about 380.5232657357.

The spelling of 55098991 in words is "fifty-five million, ninety-eight thousand, nine hundred ninety-one".