1231615 has 24 divisors (see below), whose sum is σ = 1879632. Its totient is φ = 766080.

The previous prime is 1231613. The next prime is 1231631. The reversal of 1231615 is 5161321.

It is not a de Polignac number, because 1231615 - 2¹ = 1231613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231592 and 1231601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2467 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (78318).

2^1231615 is an apocalyptic number.

1231615 is a deficient number, since it is larger than the sum of its proper divisors (648017).

1231615 is a wasteful number, since it uses less digits than its factorization.

1231615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 480 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 1231615 is about 1109.7815100280. The cubic root of 1231615 is about 107.1910001634.

Adding to 1231615 its reverse (5161321), we get a palindrome (6392936).

It can be divided in two parts, 1231 and 615, that multiplied together give a triangular number (757065 = T₁₂₃₀).

The spelling of 1231615 in words is "one million, two hundred thirty-one thousand, six hundred fifteen".