7217420537 has 4 divisors (see below), whose sum is σ = 7265218176. Its totient is φ = 7169622900.

The previous prime is 7217420521. The next prime is 7217420549. The reversal of 7217420537 is 7350247127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7350247127 = 67 ⋅109705181.

It is a cyclic number.

It is not a de Polignac number, because 7217420537 - 2⁴ = 7217420521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7217420537.

It is not an unprimeable number, because it can be changed into a prime (7217420597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23898593 + ... + 23898894.

It is an arithmetic number, because the mean of its divisors is an integer number (1816304544).

Almost surely, 2^7217420537 is an apocalyptic number.

It is an amenable number.

7217420537 is a deficient number, since it is larger than the sum of its proper divisors (47797639).

7217420537 is a wasteful number, since it uses less digits than its factorization.

7217420537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47797638.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 7217420537 is about 84955.4032242800. The cubic root of 7217420537 is about 1932.5348615117.

The spelling of 7217420537 in words is "seven billion, two hundred seventeen million, four hundred twenty thousand, five hundred thirty-seven".