1373563 has 2 divisors, whose sum is σ = 1373564. Its totient is φ = 1373562.

The previous prime is 1373557. The next prime is 1373591. The reversal of 1373563 is 3653731.

It is an a-pointer prime, because the next prime (1373591) can be obtained adding 1373563 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1373563 - 2⁵ = 1373531 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1373543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686781 + 686782.

It is an arithmetic number, because the mean of its divisors is an integer number (686782).

2^1373563 is an apocalyptic number.

1373563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373563 is an equidigital number, since it uses as much as digits as its factorization.

1373563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 28.

The square root of 1373563 is about 1171.9910409214. The cubic root of 1373563 is about 111.1602533362.

It can be divided in two parts, 1373 and 563, that added together give a square (1936 = 44²).

The spelling of 1373563 in words is "one million, three hundred seventy-three thousand, five hundred sixty-three".