61391069 has 4 divisors (see below), whose sum is σ = 61498044. Its totient is φ = 61284096.

The previous prime is 61391053. The next prime is 61391087. The reversal of 61391069 is 96019316.

61391069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61042969 + 348100 = 7813^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 61391069 - 2⁴ = 61391053 is a prime.

It is a super-2 number, since 2×61391069² = 7537726705925522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61391969) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52622 + ... + 53775.

It is an arithmetic number, because the mean of its divisors is an integer number (15374511).

Almost surely, 2^61391069 is an apocalyptic number.

It is an amenable number.

61391069 is a deficient number, since it is larger than the sum of its proper divisors (106975).

61391069 is a wasteful number, since it uses less digits than its factorization.

61391069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106974.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 61391069 is about 7835.2453056685. The cubic root of 61391069 is about 394.4891521426.

The spelling of 61391069 in words is "sixty-one million, three hundred ninety-one thousand, sixty-nine".