55901509 has 4 divisors (see below), whose sum is σ = 55918060. Its totient is φ = 55884960.

The previous prime is 55901507. The next prime is 55901513. The reversal of 55901509 is 90510955.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 52157284 = 1935^2 + 7222^2 .

It is a cyclic number.

It is not a de Polignac number, because 55901509 - 2¹ = 55901507 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 (55901507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182 + ... + 10639.

It is an arithmetic number, because the mean of its divisors is an integer number (13979515).

Almost surely, 2^55901509 is an apocalyptic number.

55901509 is the 4729-th heptagonal number.

It is an amenable number.

55901509 is a deficient number, since it is larger than the sum of its proper divisors (16551).

55901509 is a wasteful number, since it uses less digits than its factorization.

55901509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16550.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 55901509 is about 7476.7311707724. The cubic root of 55901509 is about 382.3618114740.

The spelling of 55901509 in words is "fifty-five million, nine hundred one thousand, five hundred nine".