55901791 has 4 divisors (see below), whose sum is σ = 60983784. Its totient is φ = 50819800.

The previous prime is 55901719. The next prime is 55901801. The reversal of 55901791 is 19710955.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55901791 - 2¹³ = 55893599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55901791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55905791) 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, 2540980 + ... + 2541001.

It is an arithmetic number, because the mean of its divisors is an integer number (15245946).

Almost surely, 2^55901791 is an apocalyptic number.

55901791 is a deficient number, since it is larger than the sum of its proper divisors (5081993).

55901791 is a wasteful number, since it uses less digits than its factorization.

55901791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081992.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 55901791 is about 7476.7500292574. The cubic root of 55901791 is about 382.3624544253.

It can be divided in two parts, 5590 and 1791, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 55901791 in words is "fifty-five million, nine hundred one thousand, seven hundred ninety-one".