15420551 has 8 divisors (see below), whose sum is σ = 15850464. Its totient is φ = 14993280.

The previous prime is 15420539. The next prime is 15420553. The reversal of 15420551 is 15502451.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15420551 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 (15420553) 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 7 ways as a sum of consecutive naturals, for example, 18326 + ... + 19148.

It is an arithmetic number, because the mean of its divisors is an integer number (1981308).

Almost surely, 2^15420551 is an apocalyptic number.

15420551 is a deficient number, since it is larger than the sum of its proper divisors (429913).

15420551 is an equidigital number, since it uses as much as digits as its factorization.

15420551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 15420551 is about 3926.9009409457. The cubic root of 15420551 is about 248.9048146151.

The spelling of 15420551 in words is "fifteen million, four hundred twenty thousand, five hundred fifty-one".