15420451 has 4 divisors (see below), whose sum is σ = 15437304. Its totient is φ = 15403600.

The previous prime is 15420443. The next prime is 15420463. The reversal of 15420451 is 15402451.

15420451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 15420451 - 2³ = 15420443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15420401) 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, 6970 + ... + 8911.

It is an arithmetic number, because the mean of its divisors is an integer number (3859326).

Almost surely, 2^15420451 is an apocalyptic number.

15420451 is a deficient number, since it is larger than the sum of its proper divisors (16853).

15420451 is an equidigital number, since it uses as much as digits as its factorization.

15420451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16852.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 15420451 is about 3926.8882082382. Note that the first 3 decimals coincide. The cubic root of 15420451 is about 248.9042765769.

The spelling of 15420451 in words is "fifteen million, four hundred twenty thousand, four hundred fifty-one".