45690821 has 4 divisors (see below), whose sum is σ = 49844544. Its totient is φ = 41537100.

The previous prime is 45690817. The next prime is 45690833. The reversal of 45690821 is 12809654.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 45690821 - 2² = 45690817 is a prime.

It is a super-2 number, since 2×45690821² = 4175302247308082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45690221) 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, 2076845 + ... + 2076866.

It is an arithmetic number, because the mean of its divisors is an integer number (12461136).

Almost surely, 2^45690821 is an apocalyptic number.

It is an amenable number.

45690821 is a deficient number, since it is larger than the sum of its proper divisors (4153723).

45690821 is a wasteful number, since it uses less digits than its factorization.

45690821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153722.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 45690821 is about 6759.4985760780. The cubic root of 45690821 is about 357.5002259278.

The spelling of 45690821 in words is "forty-five million, six hundred ninety thousand, eight hundred twenty-one".