61061021 has 16 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 49830000.

The previous prime is 61061009. The next prime is 61061023. The reversal of 61061021 is 12016016.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61061021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61061023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39656 + ... + 41166.

It is an arithmetic number, because the mean of its divisors is an integer number (4572288).

Almost surely, 2^61061021 is an apocalyptic number.

It is an amenable number.

61061021 is a deficient number, since it is larger than the sum of its proper divisors (12095587).

61061021 is a wasteful number, since it uses less digits than its factorization.

61061021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 61061021 is about 7814.1551686667. The cubic root of 61061021 is about 393.7809363112.

Adding to 61061021 its reverse (12016016), we get a palindrome (73077037).

The spelling of 61061021 in words is "sixty-one million, sixty-one thousand, twenty-one".