1230551645 has 4 divisors (see below), whose sum is σ = 1476661980. Its totient is φ = 984441312.

The previous prime is 1230551633. The next prime is 1230551659. The reversal of 1230551645 is 5461550321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461550321 = 55799 ⋅97879.

It can be written as a sum of positive squares in 2 ways, for example, as 406344964 + 824206681 = 20158^2 + 28709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230551645 - 2⁴ = 1230551629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123055160 + ... + 123055169.

It is an arithmetic number, because the mean of its divisors is an integer number (369165495).

Almost surely, 2^1230551645 is an apocalyptic number.

It is an amenable number.

1230551645 is a deficient number, since it is larger than the sum of its proper divisors (246110335).

1230551645 is an equidigital number, since it uses as much as digits as its factorization.

1230551645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246110334.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1230551645 is about 35079.2195608739. The cubic root of 1230551645 is about 1071.6014233168.

The spelling of 1230551645 in words is "one billion, two hundred thirty million, five hundred fifty-one thousand, six hundred forty-five".