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12691621 is a prime number
BaseRepresentation
bin110000011010…
…100010100101
3212212210122001
4300122202211
511222112441
61132005301
7212606545
oct60324245
925783561
1012691621
117189448
124300831
132824a47
141985325
1511aa731
hexc1a8a5

12691621 has 2 divisors, whose sum is σ = 12691622. Its totient is φ = 12691620.

The previous prime is 12691583. The next prime is 12691631. The reversal of 12691621 is 12619621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 864900 = 3439^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 12691621 - 29 = 12691109 is a prime.

It is a super-2 number, since 2×126916212 = 322154487215282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12691621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12691631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345810 + 6345811.

It is an arithmetic number, because the mean of its divisors is an integer number (6345811).

Almost surely, 212691621 is an apocalyptic number.

It is an amenable number.

12691621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691621 is an equidigital number, since it uses as much as digits as its factorization.

12691621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 12691621 is about 3562.5301402234. The cubic root of 12691621 is about 233.2593341308.

The spelling of 12691621 in words is "twelve million, six hundred ninety-one thousand, six hundred twenty-one".