1340100257 has 2 divisors, whose sum is σ = 1340100258. Its totient is φ = 1340100256.

The previous prime is 1340100247. The next prime is 1340100287. The reversal of 1340100257 is 7520010431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685968481 + 654131776 = 26191^2 + 25576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340100257 - 2²² = 1335905953 is a prime.

It is a super-2 number, since 2×1340100257² = 3591737397622932098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1340100227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670050128 + 670050129.

It is an arithmetic number, because the mean of its divisors is an integer number (670050129).

Almost surely, 2^1340100257 is an apocalyptic number.

It is an amenable number.

1340100257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340100257 is an equidigital number, since it uses as much as digits as its factorization.

1340100257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1340100257 is about 36607.3798160972. The cubic root of 1340100257 is about 1102.5012659663.

Adding to 1340100257 its reverse (7520010431), we get a palindrome (8860110688).

The spelling of 1340100257 in words is "one billion, three hundred forty million, one hundred thousand, two hundred fifty-seven".