1309212427 has 2 divisors, whose sum is σ = 1309212428. Its totient is φ = 1309212426.

The previous prime is 1309212409. The next prime is 1309212433. The reversal of 1309212427 is 7242129031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1309212427 - 2⁷ = 1309212299 is a prime.

It is a super-2 number, since 2×1309212427² = 3428074358022460658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1309212467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654606213 + 654606214.

It is an arithmetic number, because the mean of its divisors is an integer number (654606214).

Almost surely, 2^1309212427 is an apocalyptic number.

1309212427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309212427 is an equidigital number, since it uses as much as digits as its factorization.

1309212427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1309212427 is about 36183.0405991536. The cubic root of 1309212427 is about 1093.9648626178.

The spelling of 1309212427 in words is "one billion, three hundred nine million, two hundred twelve thousand, four hundred twenty-seven".