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55415551 = 271120441
BaseRepresentation
bin1101001101100…
…1001011111111
310212021101211211
43103121023333
5103141244201
65255425251
71242011242
oct323311377
9125241754
1055415551
112930a584
1216685227
13b633389
147507259
154ce9651
hex34d92ff

55415551 has 4 divisors (see below), whose sum is σ = 55438704. Its totient is φ = 55392400.

The previous prime is 55415537. The next prime is 55415557. The reversal of 55415551 is 15551455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55415551 - 211 = 55413503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55415557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7510 + ... + 12931.

It is an arithmetic number, because the mean of its divisors is an integer number (13859676).

Almost surely, 255415551 is an apocalyptic number.

55415551 is a deficient number, since it is larger than the sum of its proper divisors (23153).

55415551 is a wasteful number, since it uses less digits than its factorization.

55415551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23152.

The product of its digits is 12500, while the sum is 31.

The square root of 55415551 is about 7444.1622094095. The cubic root of 55415551 is about 381.2506141350.

The spelling of 55415551 in words is "fifty-five million, four hundred fifteen thousand, five hundred fifty-one".

Divisors: 1 2711 20441 55415551