203451312261 has 8 divisors (see below), whose sum is σ = 272673952960. Its totient is φ = 134931439872.

The previous prime is 203451312191. The next prime is 203451312269. The reversal of 203451312261 is 162213154302.

203451312261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 203451312261 - 2¹¹ = 203451310213 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 (203451312269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175691401 + ... + 175692558.

It is an arithmetic number, because the mean of its divisors is an integer number (34084244120).

Almost surely, 2^203451312261 is an apocalyptic number.

It is an amenable number.

203451312261 is a deficient number, since it is larger than the sum of its proper divisors (69222640699).

203451312261 is a wasteful number, since it uses less digits than its factorization.

203451312261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351384155.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 203451312261 its reverse (162213154302), we get a palindrome (365664466563).

The spelling of 203451312261 in words is "two hundred three billion, four hundred fifty-one million, three hundred twelve thousand, two hundred sixty-one".