1351821623 has 12 divisors (see below), whose sum is σ = 1447747920. Its totient is φ = 1257881856.

The previous prime is 1351821617. The next prime is 1351821637. The reversal of 1351821623 is 3261281531.

It is not a de Polignac number, because 1351821623 - 2¹⁰ = 1351820599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1351821623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351821613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129638 + ... + 139676.

It is an arithmetic number, because the mean of its divisors is an integer number (120645660).

Almost surely, 2^1351821623 is an apocalyptic number.

1351821623 is a deficient number, since it is larger than the sum of its proper divisors (95926297).

1351821623 is an equidigital number, since it uses as much as digits as its factorization.

1351821623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10234 (or 10145 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 1351821623 is about 36767.1269342602. The cubic root of 1351821623 is about 1105.7063310967.

The spelling of 1351821623 in words is "one billion, three hundred fifty-one million, eight hundred twenty-one thousand, six hundred twenty-three".