55291191 has 12 divisors (see below), whose sum is σ = 78314472. Its totient is φ = 34691968.

The previous prime is 55291189. The next prime is 55291211. The reversal of 55291191 is 19119255.

It is a happy number.

It is not a de Polignac number, because 55291191 - 2¹ = 55291189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55291111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31020 + ... + 32753.

It is an arithmetic number, because the mean of its divisors is an integer number (6526206).

Almost surely, 2^55291191 is an apocalyptic number.

55291191 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55291191 is a deficient number, since it is larger than the sum of its proper divisors (23023281).

55291191 is a wasteful number, since it uses less digits than its factorization.

55291191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63810 (or 63793 counting only the distinct ones).

The product of its digits is 4050, while the sum is 33.

The square root of 55291191 is about 7435.8046639217. The cubic root of 55291191 is about 380.9652078645.

The spelling of 55291191 in words is "fifty-five million, two hundred ninety-one thousand, one hundred ninety-one".