261207403 has 4 divisors (see below), whose sum is σ = 261464760. Its totient is φ = 260950048.

The previous prime is 261207371. The next prime is 261207407. The reversal of 261207403 is 304702162.

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 261207403 - 2⁵ = 261207371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261207407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127150 + ... + 129187.

It is an arithmetic number, because the mean of its divisors is an integer number (65366190).

Almost surely, 2^261207403 is an apocalyptic number.

261207403 is a deficient number, since it is larger than the sum of its proper divisors (257357).

261207403 is a wasteful number, since it uses less digits than its factorization.

261207403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257356.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 261207403 is about 16161.9121084109. The cubic root of 261207403 is about 639.2368858606.

Adding to 261207403 its reverse (304702162), we get a palindrome (565909565).

The spelling of 261207403 in words is "two hundred sixty-one million, two hundred seven thousand, four hundred three".