1291215 has 16 divisors (see below), whose sum is σ = 2102400. Its totient is φ = 676512.

The previous prime is 1291211. The next prime is 1291217. The reversal of 1291215 is 5121921.

It is not a de Polignac number, because 1291215 - 2² = 1291211 is a prime.

1291215 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1291191 and 1291200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156 + ... + 1614.

It is an arithmetic number, because the mean of its divisors is an integer number (131400).

2^1291215 is an apocalyptic number.

1291215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1291215 is a deficient number, since it is larger than the sum of its proper divisors (811185).

1291215 is a wasteful number, since it uses less digits than its factorization.

1291215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526.

The product of its digits is 180, while the sum is 21.

The square root of 1291215 is about 1136.3164172008. The cubic root of 1291215 is about 108.8928891970.

The spelling of 1291215 in words is "one million, two hundred ninety-one thousand, two hundred fifteen".