1351615623 has 4 divisors (see below), whose sum is σ = 1802154168. Its totient is φ = 901077080.

The previous prime is 1351615619. The next prime is 1351615637. The reversal of 1351615623 is 3265161531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3265161531 = 3 ⋅1088387177.

It is a cyclic number.

It is not a de Polignac number, because 1351615623 - 2² = 1351615619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351615423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225269268 + ... + 225269273.

It is an arithmetic number, because the mean of its divisors is an integer number (450538542).

Almost surely, 2^1351615623 is an apocalyptic number.

1351615623 is a deficient number, since it is larger than the sum of its proper divisors (450538545).

1351615623 is an equidigital number, since it uses as much as digits as its factorization.

1351615623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450538544.

The product of its digits is 16200, while the sum is 33.

The square root of 1351615623 is about 36764.3254120078. The cubic root of 1351615623 is about 1105.6501631647.

The spelling of 1351615623 in words is "one billion, three hundred fifty-one million, six hundred fifteen thousand, six hundred twenty-three".