61021618 has 8 divisors (see below), whose sum is σ = 104608512. Its totient is φ = 26152116.

The previous prime is 61021613. The next prime is 61021627. The reversal of 61021618 is 81612016.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 61021592 and 61021601.

It is not an unprimeable number, because it can be changed into a prime (61021613) 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, 2179330 + ... + 2179357.

It is an arithmetic number, because the mean of its divisors is an integer number (13076064).

Almost surely, 2^61021618 is an apocalyptic number.

61021618 is a deficient number, since it is larger than the sum of its proper divisors (43586894).

61021618 is a wasteful number, since it uses less digits than its factorization.

61021618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358696.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 61021618 is about 7811.6335039478. The cubic root of 61021618 is about 393.6962151109.

The spelling of 61021618 in words is "sixty-one million, twenty-one thousand, six hundred eighteen".