247326981 has 32 divisors (see below), whose sum is σ = 385579008. Its totient is φ = 139487040.

The previous prime is 247326953. The next prime is 247327007. The reversal of 247326981 is 189623742.

It is not a de Polignac number, because 247326981 - 2¹⁰ = 247325957 is a prime.

It is a super-2 number, since 2×247326981² = 122341271061148722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247326941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23680 + ... + 32486.

It is an arithmetic number, because the mean of its divisors is an integer number (12049344).

Almost surely, 2^247326981 is an apocalyptic number.

It is an amenable number.

247326981 is a deficient number, since it is larger than the sum of its proper divisors (138252027).

247326981 is a wasteful number, since it uses less digits than its factorization.

247326981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881.

The product of its digits is 145152, while the sum is 42.

The square root of 247326981 is about 15726.6328564000. The cubic root of 247326981 is about 627.7072798714.

It can be divided in two parts, 24732 and 6981, that added together give a palindrome (31713).

The spelling of 247326981 in words is "two hundred forty-seven million, three hundred twenty-six thousand, nine hundred eighty-one".