55201861 has 16 divisors (see below), whose sum is σ = 65778048. Its totient is φ = 45662400.

The previous prime is 55201849. The next prime is 55201879. The reversal of 55201861 is 16810255.

It is a cyclic number.

It is not a de Polignac number, because 55201861 - 2¹¹ = 55199813 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 (55201831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7435 + ... + 12871.

It is an arithmetic number, because the mean of its divisors is an integer number (4111128).

Almost surely, 2^55201861 is an apocalyptic number.

It is an amenable number.

55201861 is a deficient number, since it is larger than the sum of its proper divisors (10576187).

55201861 is a wasteful number, since it uses less digits than its factorization.

55201861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 55201861 is about 7429.7954884371. The cubic root of 55201861 is about 380.7599312472.

It can be divided in two parts, 5520 and 1861, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 55201861 in words is "fifty-five million, two hundred one thousand, eight hundred sixty-one".