[go: up one dir, main page]

Search a number
-
+
1221311071 is a prime number
BaseRepresentation
bin100100011001011…
…1011101001011111
310011010010000211101
41020302323221133
510000123423241
6321104533531
742156654451
oct11062735137
93133100741
101221311071
115774420a2
122a10212a7
13166046596
14b82ba2d1
1572349e31
hex48cbba5f

1221311071 has 2 divisors, whose sum is σ = 1221311072. Its totient is φ = 1221311070.

The previous prime is 1221311057. The next prime is 1221311081. The reversal of 1221311071 is 1701131221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221311071 - 223 = 1212922463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221311081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610655535 + 610655536.

It is an arithmetic number, because the mean of its divisors is an integer number (610655536).

Almost surely, 21221311071 is an apocalyptic number.

1221311071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221311071 is an equidigital number, since it uses as much as digits as its factorization.

1221311071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 1221311071 is about 34947.2612803922. The cubic root of 1221311071 is about 1068.9123576925.

Adding to 1221311071 its reverse (1701131221), we get a palindrome (2922442292).

The spelling of 1221311071 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, seventy-one".