1187494261 has 2 divisors, whose sum is σ = 1187494262. Its totient is φ = 1187494260.

The previous prime is 1187494247. The next prime is 1187494279. The reversal of 1187494261 is 1624947811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115159236 + 72335025 = 33394^2 + 8505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187494261 - 2⁵ = 1187494229 is a prime.

It is a super-2 number, since 2×1187494261² = 2820285239815872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187494211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593747130 + 593747131.

It is an arithmetic number, because the mean of its divisors is an integer number (593747131).

Almost surely, 2^1187494261 is an apocalyptic number.

It is an amenable number.

1187494261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187494261 is an equidigital number, since it uses as much as digits as its factorization.

1187494261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 1187494261 is about 34460.0386099610. The cubic root of 1187494261 is about 1058.9541901388.

The spelling of 1187494261 in words is "one billion, one hundred eighty-seven million, four hundred ninety-four thousand, two hundred sixty-one".