55861831 has 4 divisors (see below), whose sum is σ = 55927872. Its totient is φ = 55795792.

The previous prime is 55861789. The next prime is 55861837. The reversal of 55861831 is 13816855.

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 55861831 - 2¹³ = 55853639 is a prime.

It is a super-3 number, since 3×55861831³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55861837) 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, 31735 + ... + 33448.

It is an arithmetic number, because the mean of its divisors is an integer number (13981968).

Almost surely, 2^55861831 is an apocalyptic number.

55861831 is a deficient number, since it is larger than the sum of its proper divisors (66041).

55861831 is an equidigital number, since it uses as much as digits as its factorization.

55861831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66040.

The product of its digits is 28800, while the sum is 37.

The square root of 55861831 is about 7474.0772674625. The cubic root of 55861831 is about 382.2713252891.

The spelling of 55861831 in words is "fifty-five million, eight hundred sixty-one thousand, eight hundred thirty-one".