61028391 has 8 divisors (see below), whose sum is σ = 81696384. Its totient is φ = 40523000.

The previous prime is 61028389. The next prime is 61028393. The reversal of 61028391 is 19382016.

61028391 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 (61028389) and next prime (61028393).

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

It is a cyclic number.

It is not a de Polignac number, because 61028391 - 2¹ = 61028389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61028393) 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 7 ways as a sum of consecutive naturals, for example, 39771 + ... + 41276.

It is an arithmetic number, because the mean of its divisors is an integer number (10212048).

Almost surely, 2^61028391 is an apocalyptic number.

61028391 is a deficient number, since it is larger than the sum of its proper divisors (20667993).

61028391 is a wasteful number, since it uses less digits than its factorization.

61028391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81301.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 61028391 is about 7812.0670120014. The cubic root of 61028391 is about 393.7107804726.

The spelling of 61028391 in words is "sixty-one million, twenty-eight thousand, three hundred ninety-one".