261431707 has 2 divisors, whose sum is σ = 261431708. Its totient is φ = 261431706.

The previous prime is 261431699. The next prime is 261431713. The reversal of 261431707 is 707134162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261431707 - 2³ = 261431699 is a prime.

It is not a weakly prime, because it can be changed into another prime (261431747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130715853 + 130715854.

It is an arithmetic number, because the mean of its divisors is an integer number (130715854).

Almost surely, 2^261431707 is an apocalyptic number.

261431707 is a deficient number, since it is larger than the sum of its proper divisors (1).

261431707 is an equidigital number, since it uses as much as digits as its factorization.

261431707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 261431707 is about 16168.8498972561. The cubic root of 261431707 is about 639.4198086597.

Adding to 261431707 its reverse (707134162), we get a palindrome (968565869).

The spelling of 261431707 in words is "two hundred sixty-one million, four hundred thirty-one thousand, seven hundred seven".