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121257553 is a prime number
BaseRepresentation
bin1110011101000…
…11111001010001
322110011112002111
413032203321101
5222020220203
620010545321
73001446364
oct716437121
9273145074
10121257553
11624a065a
1234738241
131c177441
14121660db
15a9a326d
hex73a3e51

121257553 has 2 divisors, whose sum is σ = 121257554. Its totient is φ = 121257552.

The previous prime is 121257533. The next prime is 121257557. The reversal of 121257553 is 355752121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 48274704 = 8543^2 + 6948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-121257553 is a prime.

It is not a weakly prime, because it can be changed into another prime (121257557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60628776 + 60628777.

It is an arithmetic number, because the mean of its divisors is an integer number (60628777).

Almost surely, 2121257553 is an apocalyptic number.

It is an amenable number.

121257553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121257553 is an equidigital number, since it uses as much as digits as its factorization.

121257553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10500, while the sum is 31.

The square root of 121257553 is about 11011.7007314947. The cubic root of 121257553 is about 494.9594266646.

The spelling of 121257553 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, five hundred fifty-three".