1253622101 has 4 divisors (see below), whose sum is σ = 1253945100. Its totient is φ = 1253299104.

The previous prime is 1253622089. The next prime is 1253622103. The reversal of 1253622101 is 1012263521.

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 159997201 + 1093624900 = 12649^2 + 33070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253622101 - 2⁶ = 1253622037 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 (1253622103) 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, 155606 + ... + 163463.

It is an arithmetic number, because the mean of its divisors is an integer number (313486275).

Almost surely, 2^1253622101 is an apocalyptic number.

It is an amenable number.

1253622101 is a deficient number, since it is larger than the sum of its proper divisors (322999).

1253622101 is an equidigital number, since it uses as much as digits as its factorization.

1253622101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322998.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1253622101 is about 35406.5262487017. The cubic root of 1253622101 is about 1078.2568189796.

Adding to 1253622101 its reverse (1012263521), we get a palindrome (2265885622).

The spelling of 1253622101 in words is "one billion, two hundred fifty-three million, six hundred twenty-two thousand, one hundred one".