15220551 has 4 divisors (see below), whose sum is σ = 20294072. Its totient is φ = 10147032.

The previous prime is 15220529. The next prime is 15220567. The reversal of 15220551 is 15502251.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15220551 - 2¹³ = 15212359 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 (15220571) 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, 2536756 + ... + 2536761.

It is an arithmetic number, because the mean of its divisors is an integer number (5073518).

Almost surely, 2^15220551 is an apocalyptic number.

15220551 is a deficient number, since it is larger than the sum of its proper divisors (5073521).

15220551 is an equidigital number, since it uses as much as digits as its factorization.

15220551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073520.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 15220551 is about 3901.3524578023. The cubic root of 15220551 is about 247.8240546610.

The spelling of 15220551 in words is "fifteen million, two hundred twenty thousand, five hundred fifty-one".