61391070 has 96 divisors (see below), whose sum is σ = 173601792. Its totient is φ = 14962176.

The previous prime is 61391053. The next prime is 61391087. The reversal of 61391070 is 7019316.

61391070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61391053) and next prime (61391087).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160099 + ... + 160481.

It is an arithmetic number, because the mean of its divisors is an integer number (1808352).

Almost surely, 2^61391070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61391070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86800896).

61391070 is an abundant number, since it is smaller than the sum of its proper divisors (112210722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61391070 is a wasteful number, since it uses less digits than its factorization.

61391070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 61391070 is about 7835.2453694827. The cubic root of 61391070 is about 394.4891542846.

The spelling of 61391070 in words is "sixty-one million, three hundred ninety-one thousand, seventy".