4247921531 has 4 divisors (see below), whose sum is σ = 4854767472. Its totient is φ = 3641075592.

The previous prime is 4247921519. The next prime is 4247921549. The reversal of 4247921531 is 1351297424.

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

It is not a de Polignac number, because 4247921531 - 2⁶ = 4247921467 is a prime.

It is a super-2 number, since 2×4247921531² = 36089674667066767922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4247921501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303422960 + ... + 303422973.

It is an arithmetic number, because the mean of its divisors is an integer number (1213691868).

Almost surely, 2^4247921531 is an apocalyptic number.

4247921531 is a deficient number, since it is larger than the sum of its proper divisors (606845941).

4247921531 is an equidigital number, since it uses as much as digits as its factorization.

4247921531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606845940.

The product of its digits is 60480, while the sum is 38.

The square root of 4247921531 is about 65176.0809730073. The cubic root of 4247921531 is about 1619.5418013970.

The spelling of 4247921531 in words is "four billion, two hundred forty-seven million, nine hundred twenty-one thousand, five hundred thirty-one".