201425551 has 4 divisors (see below), whose sum is σ = 203208192. Its totient is φ = 199642912.

The previous prime is 201425531. The next prime is 201425563. The reversal of 201425551 is 155524102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155524102 = 2 ⋅77762051.

It is a cyclic number.

It is not a de Polignac number, because 201425551 - 2¹⁹ = 200901263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201425531) 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, 891151 + ... + 891376.

It is an arithmetic number, because the mean of its divisors is an integer number (50802048).

Almost surely, 2^201425551 is an apocalyptic number.

201425551 is a deficient number, since it is larger than the sum of its proper divisors (1782641).

201425551 is a wasteful number, since it uses less digits than its factorization.

201425551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782640.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 201425551 is about 14192.4469701317. The cubic root of 201425551 is about 586.1897049144.

Adding to 201425551 its reverse (155524102), we get a palindrome (356949653).

The spelling of 201425551 in words is "two hundred one million, four hundred twenty-five thousand, five hundred fifty-one".