245288891 has 4 divisors (see below), whose sum is σ = 246659400. Its totient is φ = 243918384.

The previous prime is 245288887. The next prime is 245288941. The reversal of 245288891 is 198882542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198882542 = 2 ⋅99441271.

It is a cyclic number.

It is not a de Polignac number, because 245288891 - 2² = 245288887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245288831) 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, 684986 + ... + 685343.

It is an arithmetic number, because the mean of its divisors is an integer number (61664850).

Almost surely, 2^245288891 is an apocalyptic number.

245288891 is a deficient number, since it is larger than the sum of its proper divisors (1370509).

245288891 is a wasteful number, since it uses less digits than its factorization.

245288891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370508.

The product of its digits is 368640, while the sum is 47.

The square root of 245288891 is about 15661.7014082123. The cubic root of 245288891 is about 625.9783214737.

The spelling of 245288891 in words is "two hundred forty-five million, two hundred eighty-eight thousand, eight hundred ninety-one".