1245106645 has 4 divisors (see below), whose sum is σ = 1494127980. Its totient is φ = 996085312.

The previous prime is 1245106609. The next prime is 1245106649. The reversal of 1245106645 is 5466015421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5466015421 = 179 ⋅30536399.

It can be written as a sum of positive squares in 2 ways, for example, as 640241809 + 604864836 = 25303^2 + 24594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245106645 - 2¹⁵ = 1245073877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1245106645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245106649) 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, 124510660 + ... + 124510669.

It is an arithmetic number, because the mean of its divisors is an integer number (373531995).

Almost surely, 2^1245106645 is an apocalyptic number.

It is an amenable number.

1245106645 is a deficient number, since it is larger than the sum of its proper divisors (249021335).

1245106645 is an equidigital number, since it uses as much as digits as its factorization.

1245106645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249021334.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1245106645 is about 35286.0687099031. The cubic root of 1245106645 is about 1075.8098516161.

The spelling of 1245106645 in words is "one billion, two hundred forty-five million, one hundred six thousand, six hundred forty-five".