1995512261 has 2 divisors, whose sum is σ = 1995512262. Its totient is φ = 1995512260.

The previous prime is 1995512257. The next prime is 1995512279. The reversal of 1995512261 is 1622155991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755107236 + 240405025 = 41894^2 + 15505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995512261 - 2² = 1995512257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1995512201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997756130 + 997756131.

It is an arithmetic number, because the mean of its divisors is an integer number (997756131).

Almost surely, 2^1995512261 is an apocalyptic number.

It is an amenable number.

1995512261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995512261 is an equidigital number, since it uses as much as digits as its factorization.

1995512261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 41.

The square root of 1995512261 is about 44671.1569247988. The cubic root of 1995512261 is about 1258.9779780273.

The spelling of 1995512261 in words is "one billion, nine hundred ninety-five million, five hundred twelve thousand, two hundred sixty-one".