61191001 has 4 divisors (see below), whose sum is σ = 64411600. Its totient is φ = 57970404.

The previous prime is 61190989. The next prime is 61191043. The reversal of 61191001 is 10019116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61191001 - 2¹⁹ = 60666713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 3220579 = 61191001 / (6 + 1 + 1 + 9 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61191001.

It is not an unprimeable number, because it can be changed into a prime (61191101) 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, 1610271 + ... + 1610308.

It is an arithmetic number, because the mean of its divisors is an integer number (16102900).

Almost surely, 2^61191001 is an apocalyptic number.

It is an amenable number.

61191001 is a deficient number, since it is larger than the sum of its proper divisors (3220599).

61191001 is a wasteful number, since it uses less digits than its factorization.

61191001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220598.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 61191001 is about 7822.4677052705. The cubic root of 61191001 is about 394.0601508309.

The spelling of 61191001 in words is "sixty-one million, one hundred ninety-one thousand, one".