1172242581 has 8 divisors (see below), whose sum is σ = 1563299040. Its totient is φ = 781340592.

The previous prime is 1172242579. The next prime is 1172242597. The reversal of 1172242581 is 1852422711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1172242581 - 2¹ = 1172242579 is a prime.

It is a super-2 number, since 2×1172242581² = 2748305337419083122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172242481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19566 + ... + 52223.

It is an arithmetic number, because the mean of its divisors is an integer number (195412380).

Almost surely, 2^1172242581 is an apocalyptic number.

It is an amenable number.

1172242581 is a deficient number, since it is larger than the sum of its proper divisors (391056459).

1172242581 is an equidigital number, since it uses as much as digits as its factorization.

1172242581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77235.

The product of its digits is 8960, while the sum is 33.

The square root of 1172242581 is about 34238.0282872715. The cubic root of 1172242581 is about 1054.4010529294.

It can be divided in two parts, 117224 and 2581, that added together give a triangular number (119805 = T₄₈₉).

The spelling of 1172242581 in words is "one billion, one hundred seventy-two million, two hundred forty-two thousand, five hundred eighty-one".