1245555401 has 4 divisors (see below), whose sum is σ = 1265974404. Its totient is φ = 1225136400.

The previous prime is 1245555347. The next prime is 1245555407. The reversal of 1245555401 is 1045555421.

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 50055625 + 1195499776 = 7075^2 + 34576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245555401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245555407) 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, 10209410 + ... + 10209531.

It is an arithmetic number, because the mean of its divisors is an integer number (316493601).

Almost surely, 2^1245555401 is an apocalyptic number.

It is an amenable number.

1245555401 is a deficient number, since it is larger than the sum of its proper divisors (20419003).

1245555401 is an equidigital number, since it uses as much as digits as its factorization.

1245555401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20419002.

The product of its (nonzero) digits is 20000, while the sum is 32.

The square root of 1245555401 is about 35292.4269638686. The cubic root of 1245555401 is about 1075.9390823502.

The spelling of 1245555401 in words is "one billion, two hundred forty-five million, five hundred fifty-five thousand, four hundred one".