61672291 has 4 divisors (see below), whose sum is σ = 61745112. Its totient is φ = 61599472.

The previous prime is 61672279. The next prime is 61672297. The reversal of 61672291 is 19227616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61672291 - 2¹¹ = 61670243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61672297) 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, 35125 + ... + 36838.

It is an arithmetic number, because the mean of its divisors is an integer number (15436278).

Almost surely, 2^61672291 is an apocalyptic number.

61672291 is a deficient number, since it is larger than the sum of its proper divisors (72821).

61672291 is an equidigital number, since it uses as much as digits as its factorization.

61672291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72820.

The product of its digits is 9072, while the sum is 34.

The square root of 61672291 is about 7853.1707609093. The cubic root of 61672291 is about 395.0905971756.

The spelling of 61672291 in words is "sixty-one million, six hundred seventy-two thousand, two hundred ninety-one".