61009191381 has 8 divisors (see below), whose sum is σ = 81360571744. Its totient is φ = 40665302640.

The previous prime is 61009191307. The next prime is 61009191427. The reversal of 61009191381 is 18319190016.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61009191381 - 2¹⁰ = 61009190357 is a prime.

It is a super-2 number, since 2×61009191381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61009191281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1853875 + ... + 1886496.

It is an arithmetic number, because the mean of its divisors is an integer number (10170071468).

Almost surely, 2^61009191381 is an apocalyptic number.

It is an amenable number.

61009191381 is a deficient number, since it is larger than the sum of its proper divisors (20351380363).

61009191381 is a wasteful number, since it uses less digits than its factorization.

61009191381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745811.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 61009191381 in words is "sixty-one billion, nine million, one hundred ninety-one thousand, three hundred eighty-one".