220401551 has 8 divisors (see below), whose sum is σ = 221618160. Its totient is φ = 219188992.

The previous prime is 220401523. The next prime is 220401569. The reversal of 220401551 is 155104022.

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

It is a cyclic number.

It is not a de Polignac number, because 220401551 - 2¹⁴ = 220385167 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 (220403551) 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, 198185 + ... + 199293.

It is an arithmetic number, because the mean of its divisors is an integer number (27702270).

Almost surely, 2^220401551 is an apocalyptic number.

220401551 is a deficient number, since it is larger than the sum of its proper divisors (1216609).

220401551 is a wasteful number, since it uses less digits than its factorization.

220401551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 220401551 is about 14845.9270845576. The cubic root of 220401551 is about 604.0481364133.

Adding to 220401551 its reverse (155104022), we get a palindrome (375505573).

The spelling of 220401551 in words is "two hundred twenty million, four hundred one thousand, five hundred fifty-one".