261373787 has 2 divisors, whose sum is σ = 261373788. Its totient is φ = 261373786.

The previous prime is 261373769. The next prime is 261373789. The reversal of 261373787 is 787373162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261373787 - 2¹⁰ = 261372763 is a prime.

Together with 261373789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261373789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130686893 + 130686894.

It is an arithmetic number, because the mean of its divisors is an integer number (130686894).

Almost surely, 2^261373787 is an apocalyptic number.

261373787 is a deficient number, since it is larger than the sum of its proper divisors (1).

261373787 is an equidigital number, since it uses as much as digits as its factorization.

261373787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 44.

The square root of 261373787 is about 16167.0586997141. The cubic root of 261373787 is about 639.3725841779.

The spelling of 261373787 in words is "two hundred sixty-one million, three hundred seventy-three thousand, seven hundred eighty-seven".