55445481 has 24 divisors (see below), whose sum is σ = 98571200. Its totient is φ = 29245536.

The previous prime is 55445461. The next prime is 55445497. The reversal of 55445481 is 18454455.

It is a happy number.

It is not a de Polignac number, because 55445481 - 2⁷ = 55445353 is a prime.

It is a super-2 number, since 2×55445481² = 6148402726642722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55445461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33031 + ... + 34668.

Almost surely, 2^55445481 is an apocalyptic number.

It is an amenable number.

55445481 is a deficient number, since it is larger than the sum of its proper divisors (43125719).

55445481 is a wasteful number, since it uses less digits than its factorization.

55445481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67725 (or 67722 counting only the distinct ones).

The product of its digits is 64000, while the sum is 36.

The square root of 55445481 is about 7446.1722381369. The cubic root of 55445481 is about 381.3192397401.

It can be divided in two parts, 5544 and 5481, that added together give a square (11025 = 105²).

The spelling of 55445481 in words is "fifty-five million, four hundred forty-five thousand, four hundred eighty-one".