261357427 has 2 divisors, whose sum is σ = 261357428. Its totient is φ = 261357426.

The previous prime is 261357403. The next prime is 261357431. The reversal of 261357427 is 724753162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261357427 is a prime.

It is not a weakly prime, because it can be changed into another prime (261357457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130678713 + 130678714.

It is an arithmetic number, because the mean of its divisors is an integer number (130678714).

Almost surely, 2^261357427 is an apocalyptic number.

261357427 is a deficient number, since it is larger than the sum of its proper divisors (1).

261357427 is an equidigital number, since it uses as much as digits as its factorization.

261357427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 37.

The square root of 261357427 is about 16166.5527246844. The cubic root of 261357427 is about 639.3592439550.

The spelling of 261357427 in words is "two hundred sixty-one million, three hundred fifty-seven thousand, four hundred twenty-seven".