101561111 has 8 divisors (see below), whose sum is σ = 107652240. Its totient is φ = 95483008.

The previous prime is 101561101. The next prime is 101561143. The reversal of 101561111 is 111165101.

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

It is a cyclic number.

It is not a de Polignac number, because 101561111 - 2¹⁰ = 101560087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 101561111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101561101) 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, 16160 + ... + 21546.

It is an arithmetic number, because the mean of its divisors is an integer number (13456530).

Almost surely, 2^101561111 is an apocalyptic number.

101561111 is a deficient number, since it is larger than the sum of its proper divisors (6091129).

101561111 is a wasteful number, since it uses less digits than its factorization.

101561111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6513.

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

The square root of 101561111 is about 10077.7532714390. The cubic root of 101561111 is about 466.5617676353.

It can be divided in two parts, 1015 and 61111, that added together give a palindrome (62126).

The spelling of 101561111 in words is "one hundred one million, five hundred sixty-one thousand, one hundred eleven".