1231915 has 8 divisors (see below), whose sum is σ = 1518480. Its totient is φ = 958752.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231915 is 5191321.

1231915 = T₉₀ + T₉₁ + ... + T₂₀₀.

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 1231915 - 2⁵ = 1231883 is a prime.

It is a super-2 number, since 2×1231915² = 3035229134450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145 + ... + 3514.

It is an arithmetic number, because the mean of its divisors is an integer number (189810).

2^1231915 is an apocalyptic number.

1231915 is a deficient number, since it is larger than the sum of its proper divisors (286565).

1231915 is an equidigital number, since it uses as much as digits as its factorization.

1231915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701.

The product of its digits is 270, while the sum is 22.

The square root of 1231915 is about 1109.9166635383. The cubic root of 1231915 is about 107.1997027448.

The spelling of 1231915 in words is "one million, two hundred thirty-one thousand, nine hundred fifteen".