61491432 has 16 divisors (see below), whose sum is σ = 153728640. Its totient is φ = 20497136.

The previous prime is 61491427. The next prime is 61491433. The reversal of 61491432 is 23419416.

It is a self number, because there is not a number n which added to its sum of digits gives 61491432.

It is not an unprimeable number, because it can be changed into a prime (61491433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281048 + ... + 1281095.

It is an arithmetic number, because the mean of its divisors is an integer number (9608040).

Almost surely, 2^61491432 is an apocalyptic number.

It is an amenable number.

61491432 is an abundant number, since it is smaller than the sum of its proper divisors (92237208).

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

61491432 is a wasteful number, since it uses less digits than its factorization.

61491432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562152 (or 2562148 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 61491432 is about 7841.6472759236. The cubic root of 61491432 is about 394.7040072768.

The spelling of 61491432 in words is "sixty-one million, four hundred ninety-one thousand, four hundred thirty-two".