61617021 has 8 divisors (see below), whose sum is σ = 82437600. Its totient is φ = 40937232.

The previous prime is 61617001. The next prime is 61617041. The reversal of 61617021 is 12071616.

It is an interprime number because it is at equal distance from previous prime (61617001) and next prime (61617041).

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

It is not a de Polignac number, because 61617021 - 2⁶ = 61616957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61616982 and 61617000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61617001) 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, 34171 + ... + 35928.

It is an arithmetic number, because the mean of its divisors is an integer number (10304700).

Almost surely, 2^61617021 is an apocalyptic number.

It is an amenable number.

61617021 is a deficient number, since it is larger than the sum of its proper divisors (20820579).

61617021 is a wasteful number, since it uses less digits than its factorization.

61617021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70395.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 61617021 is about 7849.6510113508. The cubic root of 61617021 is about 394.9725366795.

Adding to 61617021 its reverse (12071616), we get a palindrome (73688637).

The spelling of 61617021 in words is "sixty-one million, six hundred seventeen thousand, twenty-one".