61998291 has 12 divisors (see below), whose sum is σ = 92870232. Its totient is φ = 41332032.

The previous prime is 61998289. The next prime is 61998301. The reversal of 61998291 is 19289916.

61998291 is a `hidden beast` number, since 619 + 9 + 8 + 29 + 1 = 666.

It is not a de Polignac number, because 61998291 - 2¹ = 61998289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61998091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127326 + ... + 127811.

It is an arithmetic number, because the mean of its divisors is an integer number (7739186).

Almost surely, 2^61998291 is an apocalyptic number.

61998291 is a deficient number, since it is larger than the sum of its proper divisors (30871941).

61998291 is an equidigital number, since it uses as much as digits as its factorization.

61998291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255152 (or 255140 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 61998291 is about 7873.8993516554. The cubic root of 61998291 is about 395.7855243557.

The spelling of 61998291 in words is "sixty-one million, nine hundred ninety-eight thousand, two hundred ninety-one".