1187261237 has 2 divisors, whose sum is σ = 1187261238. Its totient is φ = 1187261236.

The previous prime is 1187261209. The next prime is 1187261267. The reversal of 1187261237 is 7321627811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664041361 + 523219876 = 25769^2 + 22874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187261237 - 2²² = 1183066933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1187261237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187261267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593630618 + 593630619.

It is an arithmetic number, because the mean of its divisors is an integer number (593630619).

Almost surely, 2^1187261237 is an apocalyptic number.

It is an amenable number.

1187261237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187261237 is an equidigital number, since it uses as much as digits as its factorization.

1187261237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 1187261237 is about 34456.6573683519. The cubic root of 1187261237 is about 1058.8849188191.

The spelling of 1187261237 in words is "one billion, one hundred eighty-seven million, two hundred sixty-one thousand, two hundred thirty-seven".