61001111 has 4 divisors (see below), whose sum is σ = 61040232. Its totient is φ = 60961992.

The previous prime is 61001107. The next prime is 61001119. The reversal of 61001111 is 11110016.

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 61001111 - 2² = 61001107 is a prime.

It is a super-2 number, since 2×61001111² = 7442271086468642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61001092 and 61001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61001119) 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, 17120 + ... + 20373.

It is an arithmetic number, because the mean of its divisors is an integer number (15260058).

Almost surely, 2^61001111 is an apocalyptic number.

61001111 is a deficient number, since it is larger than the sum of its proper divisors (39121).

61001111 is a wasteful number, since it uses less digits than its factorization.

61001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39120.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 61001111 is about 7810.3208000696. The cubic root of 61001111 is about 393.6521081582.

Adding to 61001111 its reverse (11110016), we get a palindrome (72111127).

The spelling of 61001111 in words is "sixty-one million, one thousand, one hundred eleven".