61001111001 has 8 divisors (see below), whose sum is σ = 82173318304. Its totient is φ = 40248155520.

The previous prime is 61001110997. The next prime is 61001111011. The reversal of 61001111001 is 10011110016.

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

It is not a de Polignac number, because 61001111001 - 2² = 61001110997 is a prime.

It is a super-2 number, since 2×61001111001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61001111011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104812615 + ... + 104813196.

It is an arithmetic number, because the mean of its divisors is an integer number (10271664788).

Almost surely, 2^61001111001 is an apocalyptic number.

It is an amenable number.

61001111001 is a deficient number, since it is larger than the sum of its proper divisors (21172207303).

61001111001 is a wasteful number, since it uses less digits than its factorization.

61001111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209625911.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 61001111001 its reverse (10011110016), we get a palindrome (71012221017).

It can be divided in two parts, 6 and 1001111001, that multiplied together give a palindrome (6006666006).

The spelling of 61001111001 in words is "sixty-one billion, one million, one hundred eleven thousand, one".