201431551 has 4 divisors (see below), whose sum is σ = 201580272. Its totient is φ = 201282832.

The previous prime is 201431543. The next prime is 201431557. The reversal of 201431551 is 155134102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201431551 - 2³ = 201431543 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201431557) 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, 72310 + ... + 75043.

It is an arithmetic number, because the mean of its divisors is an integer number (50395068).

Almost surely, 2^201431551 is an apocalyptic number.

201431551 is a deficient number, since it is larger than the sum of its proper divisors (148721).

201431551 is a wasteful number, since it uses less digits than its factorization.

201431551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148720.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 201431551 is about 14192.6583485970. The cubic root of 201431551 is about 586.1955252672.

Adding to 201431551 its reverse (155134102), we get a palindrome (356565653).

The spelling of 201431551 in words is "two hundred one million, four hundred thirty-one thousand, five hundred fifty-one".