7621961 has 2 divisors, whose sum is σ = 7621962. Its totient is φ = 7621960.

The previous prime is 7621927. The next prime is 7621981. The reversal of 7621961 is 1691267.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6661561 + 960400 = 2581^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 7621961 - 2¹⁸ = 7359817 is a prime.

It is equal to p₅₁₅₉₄₈ and since 7621961 and 515948 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (7621981) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810980 + 3810981.

It is an arithmetic number, because the mean of its divisors is an integer number (3810981).

Almost surely, 2^7621961 is an apocalyptic number.

It is an amenable number.

7621961 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621961 is an equidigital number, since it uses as much as digits as its factorization.

7621961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 7621961 is about 2760.7899231923. The cubic root of 7621961 is about 196.7987070139.

The spelling of 7621961 in words is "seven million, six hundred twenty-one thousand, nine hundred sixty-one".