202455561 has 16 divisors (see below), whose sum is σ = 336549888. Its totient is φ = 105171600.

The previous prime is 202455557. The next prime is 202455569. The reversal of 202455561 is 165554202.

It is not a de Polignac number, because 202455561 - 2² = 202455557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (202455569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437985 + ... + 438446.

It is an arithmetic number, because the mean of its divisors is an integer number (21034368).

Almost surely, 2^202455561 is an apocalyptic number.

202455561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202455561 is a deficient number, since it is larger than the sum of its proper divisors (134094327).

202455561 is a wasteful number, since it uses less digits than its factorization.

202455561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876452.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 202455561 is about 14228.6879577844. The cubic root of 202455561 is about 587.1871867850.

The spelling of 202455561 in words is "two hundred two million, four hundred fifty-five thousand, five hundred sixty-one".