1356123451 has 4 divisors (see below), whose sum is σ = 1356212592. Its totient is φ = 1356034312.

The previous prime is 1356123413. The next prime is 1356123479. The reversal of 1356123451 is 1543216531.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1356123451 - 2⁷ = 1356123323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1356123481) 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, 15376 + ... + 54301.

It is an arithmetic number, because the mean of its divisors is an integer number (339053148).

Almost surely, 2^1356123451 is an apocalyptic number.

1356123451 is a deficient number, since it is larger than the sum of its proper divisors (89141).

1356123451 is an equidigital number, since it uses as much as digits as its factorization.

1356123451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89140.

The product of its digits is 10800, while the sum is 31.

The square root of 1356123451 is about 36825.5814753820. The cubic root of 1356123451 is about 1106.8779654217.

Adding to 1356123451 its reverse (1543216531), we get a palindrome (2899339982).

The spelling of 1356123451 in words is "one billion, three hundred fifty-six million, one hundred twenty-three thousand, four hundred fifty-one".