261976051 has 2 divisors, whose sum is σ = 261976052. Its totient is φ = 261976050.

The previous prime is 261976007. The next prime is 261976061. The reversal of 261976051 is 150679162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261976051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261976051.

It is not a weakly prime, because it can be changed into another prime (261976061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130988025 + 130988026.

It is an arithmetic number, because the mean of its divisors is an integer number (130988026).

Almost surely, 2^261976051 is an apocalyptic number.

261976051 is a deficient number, since it is larger than the sum of its proper divisors (1).

261976051 is an equidigital number, since it uses as much as digits as its factorization.

261976051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 261976051 is about 16185.6742522516. The cubic root of 261976051 is about 639.8632935550.

The spelling of 261976051 in words is "two hundred sixty-one million, nine hundred seventy-six thousand, fifty-one".