1211611487 has 2 divisors, whose sum is σ = 1211611488. Its totient is φ = 1211611486.

The previous prime is 1211611447. The next prime is 1211611493. The reversal of 1211611487 is 7841161121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211611487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211611447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605805743 + 605805744.

It is an arithmetic number, because the mean of its divisors is an integer number (605805744).

Almost surely, 2^1211611487 is an apocalyptic number.

1211611487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211611487 is an equidigital number, since it uses as much as digits as its factorization.

1211611487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 32.

The square root of 1211611487 is about 34808.2100516530. The cubic root of 1211611487 is about 1066.0750859090.

The spelling of 1211611487 in words is "one billion, two hundred eleven million, six hundred eleven thousand, four hundred eighty-seven".