1295775991 has 2 divisors, whose sum is σ = 1295775992. Its totient is φ = 1295775990.

The previous prime is 1295775983. The next prime is 1295776007. The reversal of 1295775991 is 1995775921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1295775991 - 2³ = 1295775983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1295775391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647887995 + 647887996.

It is an arithmetic number, because the mean of its divisors is an integer number (647887996).

Almost surely, 2^1295775991 is an apocalyptic number.

1295775991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295775991 is an equidigital number, since it uses as much as digits as its factorization.

1295775991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1786050, while the sum is 55.

The square root of 1295775991 is about 35996.8886294357. Note that the first 3 decimals coincide. The cubic root of 1295775991 is about 1090.2095355108.

The spelling of 1295775991 in words is "one billion, two hundred ninety-five million, seven hundred seventy-five thousand, nine hundred ninety-one".