61515061 has 8 divisors (see below), whose sum is σ = 67380120. Its totient is φ = 55899648.

The previous prime is 61515043. The next prime is 61515071. The reversal of 61515061 is 16051516.

It can be written as a sum of positive squares in 4 ways, for example, as 21446161 + 40068900 = 4631^2 + 6330^2 .

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 61515061 - 2⁷ = 61514933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61515001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61896 + ... + 62881.

It is an arithmetic number, because the mean of its divisors is an integer number (8422515).

Almost surely, 2^61515061 is an apocalyptic number.

It is an amenable number.

61515061 is a deficient number, since it is larger than the sum of its proper divisors (5865059).

61515061 is a wasteful number, since it uses less digits than its factorization.

61515061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124823.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61515061 is about 7843.1537661836. The cubic root of 61515061 is about 394.7545577699.

Adding to 61515061 its reverse (16051516), we get a palindrome (77566577).

The spelling of 61515061 in words is "sixty-one million, five hundred fifteen thousand, sixty-one".