247855157 has 4 divisors (see below), whose sum is σ = 270387456. Its totient is φ = 225322860.

The previous prime is 247855147. The next prime is 247855163. The reversal of 247855157 is 751558742.

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 247855157 - 2¹⁰ = 247854133 is a prime.

It is a super-2 number, since 2×247855157² = 122864357702989298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247855147) 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, 11266133 + ... + 11266154.

It is an arithmetic number, because the mean of its divisors is an integer number (67596864).

Almost surely, 2^247855157 is an apocalyptic number.

It is an amenable number.

247855157 is a deficient number, since it is larger than the sum of its proper divisors (22532299).

247855157 is a wasteful number, since it uses less digits than its factorization.

247855157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22532298.

The product of its digits is 392000, while the sum is 44.

The square root of 247855157 is about 15743.4163065073. The cubic root of 247855157 is about 628.1537929492.

The spelling of 247855157 in words is "two hundred forty-seven million, eight hundred fifty-five thousand, one hundred fifty-seven".