55931187 has 8 divisors (see below), whose sum is σ = 80311504. Its totient is φ = 34419168.

The previous prime is 55931171. The next prime is 55931191. The reversal of 55931187 is 78113955.

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

It is not a de Polignac number, because 55931187 - 2⁴ = 55931171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1434133 = 55931187 / (5 + 5 + 9 + 3 + 1 + 1 + 8 + 7).

It is not an unprimeable number, because it can be changed into a prime (55939187) 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, 717028 + ... + 717105.

It is an arithmetic number, because the mean of its divisors is an integer number (10038938).

Almost surely, 2^55931187 is an apocalyptic number.

55931187 is a deficient number, since it is larger than the sum of its proper divisors (24380317).

55931187 is a wasteful number, since it uses less digits than its factorization.

55931187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434149.

The product of its digits is 37800, while the sum is 39.

The square root of 55931187 is about 7478.7155982829. The cubic root of 55931187 is about 382.4294645450.

The spelling of 55931187 in words is "fifty-five million, nine hundred thirty-one thousand, one hundred eighty-seven".