1201051645 has 12 divisors (see below), whose sum is σ = 1450318716. Its totient is φ = 954840960.

The previous prime is 1201051637. The next prime is 1201051661. The reversal of 1201051645 is 5461501021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 919181124 + 281870521 = 30318^2 + 16789^2 .

It is not a de Polignac number, because 1201051645 - 2³ = 1201051637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128325 + ... + 137365.

It is an arithmetic number, because the mean of its divisors is an integer number (120859893).

Almost surely, 2^1201051645 is an apocalyptic number.

It is an amenable number.

1201051645 is a deficient number, since it is larger than the sum of its proper divisors (249267071).

1201051645 is an frugal number, since it uses more digits than its factorization.

1201051645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9372 (or 9209 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1201051645 is about 34656.1920152806. The cubic root of 1201051645 is about 1062.9689062021.

Adding to 1201051645 its reverse (5461501021), we get a palindrome (6662552666).

The spelling of 1201051645 in words is "one billion, two hundred one million, fifty-one thousand, six hundred forty-five".