1623728353531 has 2 divisors, whose sum is σ = 1623728353532. Its totient is φ = 1623728353530.

The previous prime is 1623728353523. The next prime is 1623728353553. The reversal of 1623728353531 is 1353538273261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1623728353531 - 2³ = 1623728353523 is a prime.

It is a super-2 number, since 2×1623728353531² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1623728353501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811864176765 + 811864176766.

It is an arithmetic number, because the mean of its divisors is an integer number (811864176766).

Almost surely, 2^{1623728353531} is an apocalyptic number.

1623728353531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623728353531 is an equidigital number, since it uses as much as digits as its factorization.

1623728353531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 49.

The spelling of 1623728353531 in words is "one trillion, six hundred twenty-three billion, seven hundred twenty-eight million, three hundred fifty-three thousand, five hundred thirty-one".