11172731 has 2 divisors, whose sum is σ = 11172732. Its totient is φ = 11172730.

The previous prime is 11172701. The next prime is 11172739. The reversal of 11172731 is 13727111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11172731 is a prime.

It is a super-2 number, since 2×11172731² = 249659835996722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11172697 and 11172706.

It is not a weakly prime, because it can be changed into another prime (11172739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5586365 + 5586366.

It is an arithmetic number, because the mean of its divisors is an integer number (5586366).

Almost surely, 2^11172731 is an apocalyptic number.

11172731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11172731 is an equidigital number, since it uses as much as digits as its factorization.

11172731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294, while the sum is 23.

The square root of 11172731 is about 3342.5635371672. The cubic root of 11172731 is about 223.5560603216.

Adding to 11172731 its reverse (13727111), we get a palindrome (24899842).

The spelling of 11172731 in words is "eleven million, one hundred seventy-two thousand, seven hundred thirty-one".