55351561 has 8 divisors (see below), whose sum is σ = 55950048. Its totient is φ = 54756000.

The previous prime is 55351537. The next prime is 55351567. The reversal of 55351561 is 16515355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55351561 - 2⁷ = 55351433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55351567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67846 + ... + 68656.

It is an arithmetic number, because the mean of its divisors is an integer number (6993756).

Almost surely, 2^55351561 is an apocalyptic number.

It is an amenable number.

55351561 is a deficient number, since it is larger than the sum of its proper divisors (598487).

55351561 is a wasteful number, since it uses less digits than its factorization.

55351561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its digits is 11250, while the sum is 31.

The square root of 55351561 is about 7439.8629691682. The cubic root of 55351561 is about 381.1038104386.

The spelling of 55351561 in words is "fifty-five million, three hundred fifty-one thousand, five hundred sixty-one".