201511451 has 4 divisors (see below), whose sum is σ = 201552912. Its totient is φ = 201469992.

The previous prime is 201511447. The next prime is 201511477. The reversal of 201511451 is 154115102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154115102 = 2 ⋅77057551.

It is a cyclic number.

It is not a de Polignac number, because 201511451 - 2² = 201511447 is a prime.

It is a super-5 number, since 5×201511451⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201513451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12296 + ... + 23541.

It is an arithmetic number, because the mean of its divisors is an integer number (50388228).

Almost surely, 2^201511451 is an apocalyptic number.

201511451 is a deficient number, since it is larger than the sum of its proper divisors (41461).

201511451 is an equidigital number, since it uses as much as digits as its factorization.

201511451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41460.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 201511451 is about 14195.4729051201. The cubic root of 201511451 is about 586.2730219500.

Adding to 201511451 its reverse (154115102), we get a palindrome (355626553).

The spelling of 201511451 in words is "two hundred one million, five hundred eleven thousand, four hundred fifty-one".