1245666901 has 4 divisors (see below), whose sum is σ = 1279333612. Its totient is φ = 1212000192.

The previous prime is 1245666839. The next prime is 1245666911. The reversal of 1245666901 is 1096665421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 734952100 + 510714801 = 27110^2 + 22599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245666901 - 2¹¹ = 1245664853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245666911) 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, 16833300 + ... + 16833373.

It is an arithmetic number, because the mean of its divisors is an integer number (319833403).

Almost surely, 2^1245666901 is an apocalyptic number.

It is an amenable number.

1245666901 is a deficient number, since it is larger than the sum of its proper divisors (33666711).

1245666901 is an equidigital number, since it uses as much as digits as its factorization.

1245666901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666710.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1245666901 is about 35294.0065875213. The cubic root of 1245666901 is about 1075.9711868042.

The spelling of 1245666901 in words is "one billion, two hundred forty-five million, six hundred sixty-six thousand, nine hundred one".