46218521 has 4 divisors (see below), whose sum is σ = 47345844. Its totient is φ = 45091200.

The previous prime is 46218517. The next prime is 46218559. The reversal of 46218521 is 12581264.

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 7778521 + 38440000 = 2789^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 46218521 - 2² = 46218517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (46218511) 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, 563600 + ... + 563681.

It is an arithmetic number, because the mean of its divisors is an integer number (11836461).

Almost surely, 2^46218521 is an apocalyptic number.

46218521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

46218521 is a deficient number, since it is larger than the sum of its proper divisors (1127323).

46218521 is a wasteful number, since it uses less digits than its factorization.

46218521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127322.

The product of its digits is 3840, while the sum is 29.

The square root of 46218521 is about 6798.4204783170. The cubic root of 46218521 is about 358.8712614799.

Adding to 46218521 its reverse (12581264), we get a palindrome (58799785).

The spelling of 46218521 in words is "forty-six million, two hundred eighteen thousand, five hundred twenty-one".