61675991 has 4 divisors (see below), whose sum is σ = 66420312. Its totient is φ = 56931672.

The previous prime is 61675981. The next prime is 61676009. The reversal of 61675991 is 19957616.

It is a happy number.

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 61675991 - 2¹⁴ = 61659607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61675921) 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, 2372141 + ... + 2372166.

It is an arithmetic number, because the mean of its divisors is an integer number (16605078).

Almost surely, 2^61675991 is an apocalyptic number.

61675991 is a deficient number, since it is larger than the sum of its proper divisors (4744321).

61675991 is a wasteful number, since it uses less digits than its factorization.

61675991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744320.

The product of its digits is 102060, while the sum is 44.

The square root of 61675991 is about 7853.4063310133. The cubic root of 61675991 is about 395.0984981089.

The spelling of 61675991 in words is "sixty-one million, six hundred seventy-five thousand, nine hundred ninety-one".