1187744461 has 2 divisors, whose sum is σ = 1187744462. Its totient is φ = 1187744460.

The previous prime is 1187744431. The next prime is 1187744479. The reversal of 1187744461 is 1644477811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180953225 + 6791236 = 34365^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187744461 - 2²⁵ = 1154190029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187744431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593872230 + 593872231.

It is an arithmetic number, because the mean of its divisors is an integer number (593872231).

Almost surely, 2^1187744461 is an apocalyptic number.

It is an amenable number.

1187744461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187744461 is an equidigital number, since it uses as much as digits as its factorization.

1187744461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 1187744461 is about 34463.6687106872. The cubic root of 1187744461 is about 1059.0285573003.

The spelling of 1187744461 in words is "one billion, one hundred eighty-seven million, seven hundred forty-four thousand, four hundred sixty-one".