61147291 has 2 divisors, whose sum is σ = 61147292. Its totient is φ = 61147290.

The previous prime is 61147267. The next prime is 61147297. The reversal of 61147291 is 19274116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61147291 - 2²¹ = 59050139 is a prime.

It is not a weakly prime, because it can be changed into another prime (61147297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30573645 + 30573646.

It is an arithmetic number, because the mean of its divisors is an integer number (30573646).

Almost surely, 2^61147291 is an apocalyptic number.

61147291 is a deficient number, since it is larger than the sum of its proper divisors (1).

61147291 is an equidigital number, since it uses as much as digits as its factorization.

61147291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 61147291 is about 7819.6733307728. The cubic root of 61147291 is about 393.9663000371.

The spelling of 61147291 in words is "sixty-one million, one hundred forty-seven thousand, two hundred ninety-one".