8725990621 has 2 divisors, whose sum is σ = 8725990622. Its totient is φ = 8725990620.

The previous prime is 8725990523. The next prime is 8725990657. The reversal of 8725990621 is 1260995278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8538684025 + 187306596 = 92405^2 + 13686^2 .

It is a cyclic number.

It is not a de Polignac number, because 8725990621 - 2¹⁵ = 8725957853 is a prime.

It is a super-2 number, since 2×8725990621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8725990661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4362995310 + 4362995311.

It is an arithmetic number, because the mean of its divisors is an integer number (4362995311).

Almost surely, 2^8725990621 is an apocalyptic number.

It is an amenable number.

8725990621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8725990621 is an equidigital number, since it uses as much as digits as its factorization.

8725990621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 8725990621 is about 93413.0109834813. The cubic root of 8725990621 is about 2058.7561710011.

The spelling of 8725990621 in words is "eight billion, seven hundred twenty-five million, nine hundred ninety thousand, six hundred twenty-one".