261373603 has 2 divisors, whose sum is σ = 261373604. Its totient is φ = 261373602.

The previous prime is 261373583. The next prime is 261373621. The reversal of 261373603 is 306373162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261373603 - 2⁵ = 261373571 is a prime.

It is equal to p_14266804 and since 261373603 and 14266804 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (261373703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130686801 + 130686802.

It is an arithmetic number, because the mean of its divisors is an integer number (130686802).

Almost surely, 2^261373603 is an apocalyptic number.

261373603 is a deficient number, since it is larger than the sum of its proper divisors (1).

261373603 is an equidigital number, since it uses as much as digits as its factorization.

261373603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 261373603 is about 16167.0530091294. The cubic root of 261373603 is about 639.3724341443.

The spelling of 261373603 in words is "two hundred sixty-one million, three hundred seventy-three thousand, six hundred three".