201253551 has 4 divisors (see below), whose sum is σ = 268338072. Its totient is φ = 134169032.

The previous prime is 201253541. The next prime is 201253553. The reversal of 201253551 is 155352102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201253551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201253553) 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, 33542256 + ... + 33542261.

It is an arithmetic number, because the mean of its divisors is an integer number (67084518).

Almost surely, 2^201253551 is an apocalyptic number.

201253551 is a deficient number, since it is larger than the sum of its proper divisors (67084521).

201253551 is an equidigital number, since it uses as much as digits as its factorization.

201253551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67084520.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 201253551 is about 14186.3861148638. The cubic root of 201253551 is about 586.0228056293.

The spelling of 201253551 in words is "two hundred one million, two hundred fifty-three thousand, five hundred fifty-one".