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68987551 is a prime number
BaseRepresentation
bin1000001110010…
…10101010011111
311210210221010111
410013022222133
5120130100201
610502350451
71465245613
oct407125237
9153727114
1068987551
1135a3a406
121b12b427
13113a5a49
14923b343
1560cab51
hex41caa9f

68987551 has 2 divisors, whose sum is σ = 68987552. Its totient is φ = 68987550.

The previous prime is 68987539. The next prime is 68987561. The reversal of 68987551 is 15578986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68987551 - 25 = 68987519 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68987495 and 68987504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68987531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34493775 + 34493776.

It is an arithmetic number, because the mean of its divisors is an integer number (34493776).

Almost surely, 268987551 is an apocalyptic number.

68987551 is the 3715-th centered decagonal number.

68987551 is a deficient number, since it is larger than the sum of its proper divisors (1).

68987551 is an equidigital number, since it uses as much as digits as its factorization.

68987551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The square root of 68987551 is about 8305.8744873734. The cubic root of 68987551 is about 410.1319246295.

The spelling of 68987551 in words is "sixty-eight million, nine hundred eighty-seven thousand, five hundred fifty-one".