61491430 has 64 divisors (see below), whose sum is σ = 148635648. Its totient is φ = 17688960.

The previous prime is 61491427. The next prime is 61491433. The reversal of 61491430 is 3419416.

61491430 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 (61491427) and next prime (61491433).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61491433) 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 31 ways as a sum of consecutive naturals, for example, 6939 + ... + 13081.

It is an arithmetic number, because the mean of its divisors is an integer number (2322432).

Almost surely, 2^61491430 is an apocalyptic number.

61491430 is an abundant number, since it is smaller than the sum of its proper divisors (87144218).

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

61491430 is a wasteful number, since it uses less digits than its factorization.

61491430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 61491430 is about 7841.6471483994. The cubic root of 61491430 is about 394.7040029975.

The spelling of 61491430 in words is "sixty-one million, four hundred ninety-one thousand, four hundred thirty".