15222581 has 8 divisors (see below), whose sum is σ = 17142528. Its totient is φ = 13392000.

The previous prime is 15222547. The next prime is 15222583. The reversal of 15222581 is 18522251.

15222581 = T₃₀₈ + T₃₀₉ + ... + T₄₉₃.

15222581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 15222581 - 2¹⁸ = 14960437 is a prime.

It is a super-2 number, since 2×15222581² = 463453944603122, which contains 22 as substring.

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 15222581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222583) 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, 21980 + ... + 22661.

It is an arithmetic number, because the mean of its divisors is an integer number (2142816).

Almost surely, 2^15222581 is an apocalyptic number.

15222581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15222581 is a deficient number, since it is larger than the sum of its proper divisors (1919947).

15222581 is a wasteful number, since it uses less digits than its factorization.

15222581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44683.

The product of its digits is 1600, while the sum is 26.

The square root of 15222581 is about 3901.6126153169. The cubic root of 15222581 is about 247.8350717932.

The spelling of 15222581 in words is "fifteen million, two hundred twenty-two thousand, five hundred eighty-one".