247161139 has 4 divisors (see below), whose sum is σ = 260169640. Its totient is φ = 234152640.

The previous prime is 247161127. The next prime is 247161143. The reversal of 247161139 is 931161742.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 247161139 - 2⁵ = 247161107 is a prime.

It is a super-2 number, since 2×247161139² = 122177257263554642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247161149) 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, 6504222 + ... + 6504259.

It is an arithmetic number, because the mean of its divisors is an integer number (65042410).

Almost surely, 2^247161139 is an apocalyptic number.

247161139 is a deficient number, since it is larger than the sum of its proper divisors (13008501).

247161139 is a wasteful number, since it uses less digits than its factorization.

247161139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13008500.

The product of its digits is 9072, while the sum is 34.

The square root of 247161139 is about 15721.3593241806. The cubic root of 247161139 is about 627.5669480906.

The spelling of 247161139 in words is "two hundred forty-seven million, one hundred sixty-one thousand, one hundred thirty-nine".