55758391 has 4 divisors (see below), whose sum is σ = 60047512. Its totient is φ = 51469272.

The previous prime is 55758383. The next prime is 55758421. The reversal of 55758391 is 19385755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19385755 = 5 ⋅3877151.

It is a cyclic number.

It is not a de Polignac number, because 55758391 - 2³ = 55758383 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 (55758301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144541 + ... + 2144566.

It is an arithmetic number, because the mean of its divisors is an integer number (15011878).

Almost surely, 2^55758391 is an apocalyptic number.

55758391 is a deficient number, since it is larger than the sum of its proper divisors (4289121).

55758391 is a wasteful number, since it uses less digits than its factorization.

55758391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289120.

The product of its digits is 189000, while the sum is 43.

The square root of 55758391 is about 7467.1541433132. The cubic root of 55758391 is about 382.0352274193.

The spelling of 55758391 in words is "fifty-five million, seven hundred fifty-eight thousand, three hundred ninety-one".