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1231431121 is a prime number
BaseRepresentation
bin100100101100110…
…0010010111010001
310011211011011221001
41021121202113101
510010221243441
6322105502001
742341664124
oct11131422721
93154134831
101231431121
11582124478
122a44a1901
1316817a98b
14b97923bb
1573198731
hex496625d1

1231431121 has 2 divisors, whose sum is σ = 1231431122. Its totient is φ = 1231431120.

The previous prime is 1231431107. The next prime is 1231431133. The reversal of 1231431121 is 1211341321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1145145600 + 86285521 = 33840^2 + 9289^2 .

It is an emirp because it is prime and its reverse (1211341321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231431121 - 29 = 1231430609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231431191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615715560 + 615715561.

It is an arithmetic number, because the mean of its divisors is an integer number (615715561).

Almost surely, 21231431121 is an apocalyptic number.

It is an amenable number.

1231431121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231431121 is an equidigital number, since it uses as much as digits as its factorization.

1231431121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1231431121 is about 35091.7528915271. The cubic root of 1231431121 is about 1071.8566539157.

Adding to 1231431121 its reverse (1211341321), we get a palindrome (2442772442).

The spelling of 1231431121 in words is "one billion, two hundred thirty-one million, four hundred thirty-one thousand, one hundred twenty-one".