261226403 has 8 divisors (see below), whose sum is σ = 286130880. Its totient is φ = 237381760.

The previous prime is 261226393. The next prime is 261226411. The reversal of 261226403 is 304622162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261226403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261226463) 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, 264443 + ... + 265428.

It is an arithmetic number, because the mean of its divisors is an integer number (35766360).

Almost surely, 2^261226403 is an apocalyptic number.

261226403 is a deficient number, since it is larger than the sum of its proper divisors (24904477).

261226403 is a wasteful number, since it uses less digits than its factorization.

261226403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529917.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261226403 is about 16162.4998994586. The cubic root of 261226403 is about 639.2523846637.

Adding to 261226403 its reverse (304622162), we get a palindrome (565848565).

The spelling of 261226403 in words is "two hundred sixty-one million, two hundred twenty-six thousand, four hundred three".