55212761 has 4 divisors (see below), whose sum is σ = 55759524. Its totient is φ = 54666000.

The previous prime is 55212743. The next prime is 55212779. The reversal of 55212761 is 16721255.

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

It is an interprime number because it is at equal distance from previous prime (55212743) and next prime (55212779).

It can be written as a sum of positive squares in 2 ways, for example, as 44689225 + 10523536 = 6685^2 + 3244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55212761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55212961) 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, 273230 + ... + 273431.

It is an arithmetic number, because the mean of its divisors is an integer number (13939881).

Almost surely, 2^55212761 is an apocalyptic number.

It is an amenable number.

55212761 is a deficient number, since it is larger than the sum of its proper divisors (546763).

55212761 is a wasteful number, since it uses less digits than its factorization.

55212761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546762.

The product of its digits is 4200, while the sum is 29.

The square root of 55212761 is about 7430.5289852069. The cubic root of 55212761 is about 380.7849908499.

It can be divided in two parts, 5521 and 2761, that multiplied together give a triangular number (15243481 = T₅₅₂₁).

The spelling of 55212761 in words is "fifty-five million, two hundred twelve thousand, seven hundred sixty-one".