7521979 has 2 divisors, whose sum is σ = 7521980. Its totient is φ = 7521978.

The previous prime is 7521977. The next prime is 7522003. The reversal of 7521979 is 9791257.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7521979 - 2¹ = 7521977 is a prime.

Together with 7521977, it forms a pair of twin primes.

7521979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7521977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3760989 + 3760990.

It is an arithmetic number, because the mean of its divisors is an integer number (3760990).

Almost surely, 2^7521979 is an apocalyptic number.

7521979 is a deficient number, since it is larger than the sum of its proper divisors (1).

7521979 is an equidigital number, since it uses as much as digits as its factorization.

7521979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 40.

The square root of 7521979 is about 2742.6226499466. The cubic root of 7521979 is about 195.9344064140.

The spelling of 7521979 in words is "seven million, five hundred twenty-one thousand, nine hundred seventy-nine".