101215745 has 4 divisors (see below), whose sum is σ = 121458900. Its totient is φ = 80972592.

The previous prime is 101215733. The next prime is 101215747. The reversal of 101215745 is 547512101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547512101 = 53 ⋅10330417.

It can be written as a sum of positive squares in 2 ways, for example, as 23193856 + 78021889 = 4816^2 + 8833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101215745 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101215747) 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, 10121570 + ... + 10121579.

It is an arithmetic number, because the mean of its divisors is an integer number (30364725).

Almost surely, 2^101215745 is an apocalyptic number.

It is an amenable number.

101215745 is a deficient number, since it is larger than the sum of its proper divisors (20243155).

101215745 is an equidigital number, since it uses as much as digits as its factorization.

101215745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20243154.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 101215745 is about 10060.6036101220. The cubic root of 101215745 is about 466.0323078658.

Adding to 101215745 its reverse (547512101), we get a palindrome (648727846).

The spelling of 101215745 in words is "one hundred one million, two hundred fifteen thousand, seven hundred forty-five".