1172242531 has 4 divisors (see below), whose sum is σ = 1241197992. Its totient is φ = 1103287072.

The previous prime is 1172242529. The next prime is 1172242543. The reversal of 1172242531 is 1352422711.

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 1172242531 - 2¹ = 1172242529 is a prime.

It is a super-2 number, since 2×1172242531² = 2748305102970571922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1172242531.

It is not an unprimeable number, because it can be changed into a prime (1172246531) 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, 34477705 + ... + 34477738.

It is an arithmetic number, because the mean of its divisors is an integer number (310299498).

Almost surely, 2^1172242531 is an apocalyptic number.

1172242531 is a deficient number, since it is larger than the sum of its proper divisors (68955461).

1172242531 is an equidigital number, since it uses as much as digits as its factorization.

1172242531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68955460.

The product of its digits is 3360, while the sum is 28.

The square root of 1172242531 is about 34238.0275570892. The cubic root of 1172242531 is about 1054.4010379382.

The spelling of 1172242531 in words is "one billion, one hundred seventy-two million, two hundred forty-two thousand, five hundred thirty-one".