61975191 has 4 divisors (see below), whose sum is σ = 82633592. Its totient is φ = 41316792.

The previous prime is 61975181. The next prime is 61975237. The reversal of 61975191 is 19157916.

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

It is not a de Polignac number, because 61975191 - 2¹⁴ = 61958807 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 (61975171) 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, 10329196 + ... + 10329201.

It is an arithmetic number, because the mean of its divisors is an integer number (20658398).

Almost surely, 2^61975191 is an apocalyptic number.

61975191 is a deficient number, since it is larger than the sum of its proper divisors (20658401).

61975191 is a wasteful number, since it uses less digits than its factorization.

61975191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20658400.

The product of its digits is 17010, while the sum is 39.

The square root of 61975191 is about 7872.4323433104. The cubic root of 61975191 is about 395.7363628859.

It can be divided in two parts, 6 and 1975191, that multiplied together give a triangular number (11851146 = T₄₈₆₈).

The spelling of 61975191 in words is "sixty-one million, nine hundred seventy-five thousand, one hundred ninety-one".