615881 has 6 divisors (see below), whose sum is σ = 716490. Its totient is φ = 527856.

The previous prime is 615869. The next prime is 615883. The reversal of 615881 is 188516.

615881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 1225 = 784^2 + 35^2 .

It is not a de Polignac number, because 615881 - 2¹⁸ = 353737 is a prime.

It is a super-2 number, since 2×615881² = 758618812322, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 615881.

It is not an unprimeable number, because it can be changed into a prime (615883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6236 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (119415).

2⁶¹⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

615881 is a deficient number, since it is larger than the sum of its proper divisors (100609).

615881 is a wasteful number, since it uses less digits than its factorization.

615881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12583 (or 12576 counting only the distinct ones).

The product of its digits is 1920, while the sum is 29.

The square root of 615881 is about 784.7808611326. The cubic root of 615881 is about 85.0809378998.

The spelling of 615881 in words is "six hundred fifteen thousand, eight hundred eighty-one".