1361245857 has 4 divisors (see below), whose sum is σ = 1814994480. Its totient is φ = 907497236.

The previous prime is 1361245849. The next prime is 1361245859. The reversal of 1361245857 is 7585421631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1361245857 - 2³ = 1361245849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1361245859) 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, 226874307 + ... + 226874312.

It is an arithmetic number, because the mean of its divisors is an integer number (453748620).

Almost surely, 2^1361245857 is an apocalyptic number.

It is an amenable number.

1361245857 is a deficient number, since it is larger than the sum of its proper divisors (453748623).

1361245857 is an equidigital number, since it uses as much as digits as its factorization.

1361245857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453748622.

The product of its digits is 201600, while the sum is 42.

The square root of 1361245857 is about 36895.0654830697. The cubic root of 1361245857 is about 1108.2698629014.

The spelling of 1361245857 in words is "one billion, three hundred sixty-one million, two hundred forty-five thousand, eight hundred fifty-seven".