55143405 has 12 divisors (see below), whose sum is σ = 95581980. Its totient is φ = 29409792.

The previous prime is 55143391. The next prime is 55143449. The reversal of 55143405 is 50434155.

It can be written as a sum of positive squares in 2 ways, for example, as 9418761 + 45724644 = 3069^2 + 6762^2 .

It is not a de Polignac number, because 55143405 - 2¹¹ = 55141357 is a prime.

It is a super-2 number, since 2×55143405² = 6081590229988050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612660 + ... + 612749.

It is an arithmetic number, because the mean of its divisors is an integer number (7965165).

Almost surely, 2^55143405 is an apocalyptic number.

It is an amenable number.

55143405 is a deficient number, since it is larger than the sum of its proper divisors (40438575).

55143405 is a wasteful number, since it uses less digits than its factorization.

55143405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225420 (or 1225417 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55143405 is about 7425.8605561915. The cubic root of 55143405 is about 380.6254818925.

It can be divided in two parts, 551 and 43405, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 55143405 in words is "fifty-five million, one hundred forty-three thousand, four hundred five".