7621513 has 2 divisors, whose sum is σ = 7621514. Its totient is φ = 7621512.

The previous prime is 7621507. The next prime is 7621517. The reversal of 7621513 is 3151267.

7621513 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6512704 + 1108809 = 2552^2 + 1053^2 .

It is a cyclic number.

It is not a de Polignac number, because 7621513 - 2²¹ = 5524361 is a prime.

It is an Ulam number.

7621513 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7621517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810756 + 3810757.

It is an arithmetic number, because the mean of its divisors is an integer number (3810757).

Almost surely, 2^7621513 is an apocalyptic number.

It is an amenable number.

7621513 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621513 is an equidigital number, since it uses as much as digits as its factorization.

7621513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 7621513 is about 2760.7087858012. The cubic root of 7621513 is about 196.7948511581.

The spelling of 7621513 in words is "seven million, six hundred twenty-one thousand, five hundred thirteen".