201551553 has 72 divisors (see below), whose sum is σ = 365354496. Its totient is φ = 106444800.

The previous prime is 201551551. The next prime is 201551579. The reversal of 201551553 is 355155102.

It is not a de Polignac number, because 201551553 - 2¹ = 201551551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201551551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 314113 + ... + 314753.

It is an arithmetic number, because the mean of its divisors is an integer number (5074368).

Almost surely, 2^201551553 is an apocalyptic number.

201551553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

201551553 is a deficient number, since it is larger than the sum of its proper divisors (163802943).

201551553 is a wasteful number, since it uses less digits than its factorization.

201551553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 201551553 is about 14196.8853274231. The cubic root of 201551553 is about 586.3119099986.

The spelling of 201551553 in words is "two hundred one million, five hundred fifty-one thousand, five hundred fifty-three".