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691553 is a prime number
BaseRepresentation
bin10101000110101100001
31022010122002
42220311201
5134112203
622453345
75610122
oct2506541
91263562
10691553
11432635
12294255
131b2a05
14140049
15d9d88
hexa8d61

691553 has 2 divisors, whose sum is σ = 691554. Its totient is φ = 691552.

The previous prime is 691531. The next prime is 691573. The reversal of 691553 is 355196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508369 + 183184 = 713^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 691553 - 26 = 691489 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691553.

It is not a weakly prime, because it can be changed into another prime (691573) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345776 + 345777.

It is an arithmetic number, because the mean of its divisors is an integer number (345777).

2691553 is an apocalyptic number.

It is an amenable number.

691553 is a deficient number, since it is larger than the sum of its proper divisors (1).

691553 is an equidigital number, since it uses as much as digits as its factorization.

691553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 691553 is about 831.5966570399. The cubic root of 691553 is about 88.4318050622.

The spelling of 691553 in words is "six hundred ninety-one thousand, five hundred fifty-three".