261301314851 has 2 divisors, whose sum is σ = 261301314852. Its totient is φ = 261301314850.

The previous prime is 261301314817. The next prime is 261301314881. The reversal of 261301314851 is 158413103162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261301314851 - 2²² = 261297120547 is a prime.

It is a super-2 number, since 2×261301314851² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261301314881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130650657425 + 130650657426.

It is an arithmetic number, because the mean of its divisors is an integer number (130650657426).

Almost surely, 2^261301314851 is an apocalyptic number.

261301314851 is a deficient number, since it is larger than the sum of its proper divisors (1).

261301314851 is an equidigital number, since it uses as much as digits as its factorization.

261301314851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 261301314851 in words is "two hundred sixty-one billion, three hundred one million, three hundred fourteen thousand, eight hundred fifty-one".