247990061 has 4 divisors (see below), whose sum is σ = 270534624. Its totient is φ = 225445500.

The previous prime is 247990027. The next prime is 247990079. The reversal of 247990061 is 160099742.

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 247990061 - 2⁶ = 247989997 is a prime.

It is a super-2 number, since 2×247990061² = 122998140709567442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247989997 and 247990024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247990081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11272265 + ... + 11272286.

It is an arithmetic number, because the mean of its divisors is an integer number (67633656).

Almost surely, 2^247990061 is an apocalyptic number.

It is an amenable number.

247990061 is a deficient number, since it is larger than the sum of its proper divisors (22544563).

247990061 is a wasteful number, since it uses less digits than its factorization.

247990061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22544562.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 247990061 is about 15747.7001812963. The cubic root of 247990061 is about 628.2677373064.

The spelling of 247990061 in words is "two hundred forty-seven million, nine hundred ninety thousand, sixty-one".