61426721 has 8 divisors (see below), whose sum is σ = 64509504. Its totient is φ = 58378320.

The previous prime is 61426711. The next prime is 61426769. The reversal of 61426721 is 12762416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61426721 is a prime.

It is a super-3 number, since 3×61426721³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61426711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4895 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (8063688).

Almost surely, 2^61426721 is an apocalyptic number.

It is an amenable number.

61426721 is a deficient number, since it is larger than the sum of its proper divisors (3082783).

61426721 is a wasteful number, since it uses less digits than its factorization.

61426721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17191.

The product of its digits is 4032, while the sum is 29.

The square root of 61426721 is about 7837.5200797191. The cubic root of 61426721 is about 394.5655020407.

The spelling of 61426721 in words is "sixty-one million, four hundred twenty-six thousand, seven hundred twenty-one".