261303451 has 2 divisors, whose sum is σ = 261303452. Its totient is φ = 261303450.

The previous prime is 261303439. The next prime is 261303457. The reversal of 261303451 is 154303162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261303451 - 2¹³ = 261295259 is a prime.

It is not a weakly prime, because it can be changed into another prime (261303457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130651725 + 130651726.

It is an arithmetic number, because the mean of its divisors is an integer number (130651726).

Almost surely, 2^261303451 is an apocalyptic number.

261303451 is a deficient number, since it is larger than the sum of its proper divisors (1).

261303451 is an equidigital number, since it uses as much as digits as its factorization.

261303451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 261303451 is about 16164.8832658946. The cubic root of 261303451 is about 639.3152270559.

The spelling of 261303451 in words is "two hundred sixty-one million, three hundred three thousand, four hundred fifty-one".