101051561 has 4 divisors (see below), whose sum is σ = 108824772. Its totient is φ = 93278352.

The previous prime is 101051543. The next prime is 101051569. The reversal of 101051561 is 165150101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165150101 = 10853 ⋅15217.

It can be written as a sum of positive squares in 2 ways, for example, as 40896025 + 60155536 = 6395^2 + 7756^2 .

It is a cyclic number.

It is not a de Polignac number, because 101051561 - 2¹⁴ = 101035177 is a prime.

It is a super-2 number, since 2×101051561² = 20422835961073442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101051569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3886586 + ... + 3886611.

It is an arithmetic number, because the mean of its divisors is an integer number (27206193).

Almost surely, 2^101051561 is an apocalyptic number.

It is an amenable number.

101051561 is a deficient number, since it is larger than the sum of its proper divisors (7773211).

101051561 is an equidigital number, since it uses as much as digits as its factorization.

101051561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773210.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 101051561 is about 10052.4405494387. The cubic root of 101051561 is about 465.7801848457.

The spelling of 101051561 in words is "one hundred one million, fifty-one thousand, five hundred sixty-one".