1231461509 has 2 divisors, whose sum is σ = 1231461510. Its totient is φ = 1231461508.

The previous prime is 1231461479. The next prime is 1231461533. The reversal of 1231461509 is 9051641321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200969025 + 30492484 = 34655^2 + 5522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231461509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231461409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615730754 + 615730755.

It is an arithmetic number, because the mean of its divisors is an integer number (615730755).

Almost surely, 2^1231461509 is an apocalyptic number.

It is an amenable number.

1231461509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231461509 is an equidigital number, since it uses as much as digits as its factorization.

1231461509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1231461509 is about 35092.1858680818. The cubic root of 1231461509 is about 1071.8654705712.

The spelling of 1231461509 in words is "one billion, two hundred thirty-one million, four hundred sixty-one thousand, five hundred nine".