1247411861 has 2 divisors, whose sum is σ = 1247411862. Its totient is φ = 1247411860.

The previous prime is 1247411833. The next prime is 1247411881. The reversal of 1247411861 is 1681147421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042062961 + 205348900 = 32281^2 + 14330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247411861 - 2⁶ = 1247411797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247411881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623705930 + 623705931.

It is an arithmetic number, because the mean of its divisors is an integer number (623705931).

Almost surely, 2^1247411861 is an apocalyptic number.

It is an amenable number.

1247411861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247411861 is an equidigital number, since it uses as much as digits as its factorization.

1247411861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 35.

The square root of 1247411861 is about 35318.7182808210. The cubic root of 1247411861 is about 1076.4733677825.

The spelling of 1247411861 in words is "one billion, two hundred forty-seven million, four hundred eleven thousand, eight hundred sixty-one".