7213557 has 16 divisors (see below), whose sum is σ = 10640000. Its totient is φ = 4318272.

The previous prime is 7213553. The next prime is 7213561. The reversal of 7213557 is 7553127.

It is an interprime number because it is at equal distance from previous prime (7213553) and next prime (7213561).

It is not a de Polignac number, because 7213557 - 2² = 7213553 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 (7213553) 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 15 ways as a sum of consecutive naturals, for example, 1057 + ... + 3942.

It is an arithmetic number, because the mean of its divisors is an integer number (665000).

Almost surely, 2^7213557 is an apocalyptic number.

It is an amenable number.

7213557 is a deficient number, since it is larger than the sum of its proper divisors (3426443).

7213557 is a wasteful number, since it uses less digits than its factorization.

7213557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5052.

The product of its digits is 7350, while the sum is 30.

The square root of 7213557 is about 2685.8065827606. The cubic root of 7213557 is about 193.2189966704.

It can be divided in two parts, 721 and 3557, that added together give a triangular number (4278 = T₉₂).

The spelling of 7213557 in words is "seven million, two hundred thirteen thousand, five hundred fifty-seven".