55151761 has 4 divisors (see below), whose sum is σ = 63030592. Its totient is φ = 47272932.

The previous prime is 55151753. The next prime is 55151771. The reversal of 55151761 is 16715155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55151761 - 2³ = 55151753 is a prime.

It is a super-2 number, since 2×55151761² = 6083433482802242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55151771) 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 3 ways as a sum of consecutive naturals, for example, 3939405 + ... + 3939418.

It is an arithmetic number, because the mean of its divisors is an integer number (15757648).

Almost surely, 2^55151761 is an apocalyptic number.

It is an amenable number.

55151761 is a deficient number, since it is larger than the sum of its proper divisors (7878831).

55151761 is an equidigital number, since it uses as much as digits as its factorization.

55151761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878830.

The product of its digits is 5250, while the sum is 31.

The square root of 55151761 is about 7426.4231632732. The cubic root of 55151761 is about 380.6447065903.

The spelling of 55151761 in words is "fifty-five million, one hundred fifty-one thousand, seven hundred sixty-one".