55121535 has 24 divisors (see below), whose sum is σ = 109193760. Its totient is φ = 25198272.

The previous prime is 55121533. The next prime is 55121551. The reversal of 55121535 is 53512155.

55121535 is a `hidden beast` number, since 5 + 5 + 121 + 535 = 666.

It is not a de Polignac number, because 55121535 - 2¹ = 55121533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55121499 and 55121508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121533) 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, 87180 + ... + 87809.

It is an arithmetic number, because the mean of its divisors is an integer number (4549740).

Almost surely, 2^55121535 is an apocalyptic number.

55121535 is a deficient number, since it is larger than the sum of its proper divisors (54072225).

55121535 is a wasteful number, since it uses less digits than its factorization.

55121535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175007 (or 175004 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 55121535 is about 7424.3878535540. The cubic root of 55121535 is about 380.5751562612.

The spelling of 55121535 in words is "fifty-five million, one hundred twenty-one thousand, five hundred thirty-five".