1181412157 has 2 divisors, whose sum is σ = 1181412158. Its totient is φ = 1181412156.

The previous prime is 1181412107. The next prime is 1181412173. The reversal of 1181412157 is 7512141811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176421401 + 4990756 = 34299^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181412157 - 2¹⁵ = 1181379389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1181412107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590706078 + 590706079.

It is an arithmetic number, because the mean of its divisors is an integer number (590706079).

Almost surely, 2^1181412157 is an apocalyptic number.

It is an amenable number.

1181412157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181412157 is an equidigital number, since it uses as much as digits as its factorization.

1181412157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 31.

The square root of 1181412157 is about 34371.6766684432. The cubic root of 1181412157 is about 1057.1431787635.

Adding to 1181412157 its reverse (7512141811), we get a palindrome (8693553968).

It can be divided in two parts, 1181412 and 157, that added together give a square (1181569 = 1087²).

The spelling of 1181412157 in words is "one billion, one hundred eighty-one million, four hundred twelve thousand, one hundred fifty-seven".