1295817121 has 8 divisors (see below), whose sum is σ = 1341343080. Its totient is φ = 1250347392.

The previous prime is 1295817101. The next prime is 1295817137. The reversal of 1295817121 is 1217185921.

It can be written as a sum of positive squares in 4 ways, for example, as 122412096 + 1173405025 = 11064^2 + 34255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1295817121 - 2⁹ = 1295816609 is a prime.

It is a super-2 number, since 2×1295817121² = 3358284022153457282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1295817101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35901 + ... + 62293.

It is an arithmetic number, because the mean of its divisors is an integer number (167667885).

Almost surely, 2^1295817121 is an apocalyptic number.

It is an amenable number.

1295817121 is a deficient number, since it is larger than the sum of its proper divisors (45525959).

1295817121 is a wasteful number, since it uses less digits than its factorization.

1295817121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28115.

The product of its digits is 10080, while the sum is 37.

The square root of 1295817121 is about 35997.4599242780. The cubic root of 1295817121 is about 1090.2210703862.

The spelling of 1295817121 in words is "one billion, two hundred ninety-five million, eight hundred seventeen thousand, one hundred twenty-one".