1295991 has 6 divisors (see below), whose sum is σ = 1872000. Its totient is φ = 863988.

The previous prime is 1295989. The next prime is 1295993. The reversal of 1295991 is 1995921.

It is an interprime number because it is at equal distance from previous prime (1295989) and next prime (1295993).

It is not a de Polignac number, because 1295991 - 2¹ = 1295989 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1295993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71991 + ... + 72008.

It is an arithmetic number, because the mean of its divisors is an integer number (312000).

2^1295991 is an apocalyptic number.

1295991 is a deficient number, since it is larger than the sum of its proper divisors (576009).

1295991 is a wasteful number, since it uses less digits than its factorization.

1295991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144005 (or 144002 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 1295991 is about 1138.4160048067. The cubic root of 1295991 is about 109.0269831915.

It can be divided in two parts, 129599 and 1, that added together give a square (129600 = 360²).

The spelling of 1295991 in words is "one million, two hundred ninety-five thousand, nine hundred ninety-one".