615121 has 4 divisors (see below), whose sum is σ = 662452. Its totient is φ = 567792.

The previous prime is 615107. The next prime is 615137. The reversal of 615121 is 121516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 297025 = 564^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 615121 - 2⁹ = 614609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 615095 and 615104.

It is not an unprimeable number, because it can be changed into a prime (615101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23646 + ... + 23671.

It is an arithmetic number, because the mean of its divisors is an integer number (165613).

2⁶¹⁵¹²¹ is an apocalyptic number.

It is an amenable number.

615121 is a deficient number, since it is larger than the sum of its proper divisors (47331).

615121 is a wasteful number, since it uses less digits than its factorization.

615121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47330.

The product of its digits is 60, while the sum is 16.

The square root of 615121 is about 784.2965000559. The cubic root of 615121 is about 85.0459267377.

Adding to 615121 its reverse (121516), we get a palindrome (736637).

The spelling of 615121 in words is "six hundred fifteen thousand, one hundred twenty-one".