85621015 has 4 divisors (see below), whose sum is σ = 102745224. Its totient is φ = 68496808.

The previous prime is 85621013. The next prime is 85621037. The reversal of 85621015 is 51012658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51012658 = 2 ⋅25506329.

It is a cyclic number.

It is not a de Polignac number, because 85621015 - 2¹ = 85621013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85621013) 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, 8562097 + ... + 8562106.

It is an arithmetic number, because the mean of its divisors is an integer number (25686306).

Almost surely, 2^85621015 is an apocalyptic number.

85621015 is a deficient number, since it is larger than the sum of its proper divisors (17124209).

85621015 is a wasteful number, since it uses less digits than its factorization.

85621015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124208.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 85621015 is about 9253.1624323795. The cubic root of 85621015 is about 440.7511532215.

The spelling of 85621015 in words is "eighty-five million, six hundred twenty-one thousand, fifteen".