261351151 has 2 divisors, whose sum is σ = 261351152. Its totient is φ = 261351150.

The previous prime is 261351131. The next prime is 261351203. The reversal of 261351151 is 151153162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261351151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261351131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130675575 + 130675576.

It is an arithmetic number, because the mean of its divisors is an integer number (130675576).

Almost surely, 2^261351151 is an apocalyptic number.

261351151 is a deficient number, since it is larger than the sum of its proper divisors (1).

261351151 is an equidigital number, since it uses as much as digits as its factorization.

261351151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 261351151 is about 16166.3586190583. The cubic root of 261351151 is about 639.3541262499.

The spelling of 261351151 in words is "two hundred sixty-one million, three hundred fifty-one thousand, one hundred fifty-one".