55215137 has 8 divisors (see below), whose sum is σ = 57000000. Its totient is φ = 53445744.

The previous prime is 55215119. The next prime is 55215161. The reversal of 55215137 is 73151255.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55215137 - 2⁶ = 55215073 is a prime.

It is a super-2 number, since 2×55215137² = 6097422707857538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3614 + ... + 11112.

It is an arithmetic number, because the mean of its divisors is an integer number (7125000).

Almost surely, 2^55215137 is an apocalyptic number.

It is an amenable number.

55215137 is a deficient number, since it is larger than the sum of its proper divisors (1784863).

55215137 is a wasteful number, since it uses less digits than its factorization.

55215137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7735.

The product of its digits is 5250, while the sum is 29.

The square root of 55215137 is about 7430.6888644324. The cubic root of 55215137 is about 380.7904529456.

The spelling of 55215137 in words is "fifty-five million, two hundred fifteen thousand, one hundred thirty-seven".