61001111051 has 4 divisors (see below), whose sum is σ = 61106832792. Its totient is φ = 60895389312.

The previous prime is 61001111021. The next prime is 61001111099. The reversal of 61001111051 is 15011110016.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61001111051 is a prime.

It is a super-2 number, since 2×61001111051² (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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52860005 + ... + 52861158.

It is an arithmetic number, because the mean of its divisors is an integer number (15276708198).

Almost surely, 2^61001111051 is an apocalyptic number.

61001111051 is a deficient number, since it is larger than the sum of its proper divisors (105721741).

61001111051 is a wasteful number, since it uses less digits than its factorization.

61001111051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105721740.

The product of its (nonzero) digits is 30, while the sum is 17.

Adding to 61001111051 its reverse (15011110016), we get a palindrome (76012221067).

The spelling of 61001111051 in words is "sixty-one billion, one million, one hundred eleven thousand, fifty-one".