961815 has 16 divisors (see below), whose sum is σ = 1581408. Its totient is φ = 498816.

The previous prime is 961813. The next prime is 961817. The reversal of 961815 is 518169.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (961813) and next prime (961817).

It is not a de Polignac number, because 961815 - 2¹ = 961813 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 961815.

It is not an unprimeable number, because it can be changed into a prime (961811) 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, 312 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (98838).

2⁹⁶¹⁸¹⁵ is an apocalyptic number.

961815 is a deficient number, since it is larger than the sum of its proper divisors (619593).

961815 is a wasteful number, since it uses less digits than its factorization.

961815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778.

The product of its digits is 2160, while the sum is 30.

The square root of 961815 is about 980.7216730551. The cubic root of 961815 is about 98.7106129309.

The spelling of 961815 in words is "nine hundred sixty-one thousand, eight hundred fifteen".