1340561623 has 2 divisors, whose sum is σ = 1340561624. Its totient is φ = 1340561622.

The previous prime is 1340561611. The next prime is 1340561641. The reversal of 1340561623 is 3261650431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340561623 - 2²¹ = 1338464471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340561653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670280811 + 670280812.

It is an arithmetic number, because the mean of its divisors is an integer number (670280812).

Almost surely, 2^1340561623 is an apocalyptic number.

1340561623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340561623 is an equidigital number, since it uses as much as digits as its factorization.

1340561623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1340561623 is about 36613.6808174212. The cubic root of 1340561623 is about 1102.6277734756.

The spelling of 1340561623 in words is "one billion, three hundred forty million, five hundred sixty-one thousand, six hundred twenty-three".