55771947 has 36 divisors (see below), whose sum is σ = 102240216. Its totient is φ = 28969920.

The previous prime is 55771909. The next prime is 55771957. The reversal of 55771947 is 74917755.

55771947 is a `hidden beast` number, since 557 + 7 + 1 + 94 + 7 = 666.

55771947 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 55771947 - 2⁷ = 55771819 is a prime.

It is a super-2 number, since 2×55771947² = 6221020144341618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55771957) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 898 + ... + 10599.

It is an arithmetic number, because the mean of its divisors is an integer number (2840006).

Almost surely, 2^55771947 is an apocalyptic number.

55771947 is a deficient number, since it is larger than the sum of its proper divisors (46468269).

55771947 is a wasteful number, since it uses less digits than its factorization.

55771947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11528 (or 11518 counting only the distinct ones).

The product of its digits is 308700, while the sum is 45.

The square root of 55771947 is about 7468.0617967449. The cubic root of 55771947 is about 382.0661850911.

The spelling of 55771947 in words is "fifty-five million, seven hundred seventy-one thousand, nine hundred forty-seven".