455661021 has 16 divisors (see below), whose sum is σ = 661579200. Its totient is φ = 277861248.

The previous prime is 455661007. The next prime is 455661023. The reversal of 455661021 is 120166554.

It is not a de Polignac number, because 455661021 - 2¹³ = 455652829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 455661021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455661023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136176 + ... + 139481.

It is an arithmetic number, because the mean of its divisors is an integer number (41348700).

Almost surely, 2^455661021 is an apocalyptic number.

It is an amenable number.

455661021 is a deficient number, since it is larger than the sum of its proper divisors (205918179).

455661021 is a wasteful number, since it uses less digits than its factorization.

455661021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275708.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 455661021 is about 21346.2179554131. The cubic root of 455661021 is about 769.5094536738.

The spelling of 455661021 in words is "four hundred fifty-five million, six hundred sixty-one thousand, twenty-one".