1247912461 has 2 divisors, whose sum is σ = 1247912462. Its totient is φ = 1247912460.

The previous prime is 1247912383. The next prime is 1247912467. The reversal of 1247912461 is 1642197421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1128556836 + 119355625 = 33594^2 + 10925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247912461 - 2⁹ = 1247911949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1247912461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247912467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623956230 + 623956231.

It is an arithmetic number, because the mean of its divisors is an integer number (623956231).

Almost surely, 2^1247912461 is an apocalyptic number.

It is an amenable number.

1247912461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247912461 is an equidigital number, since it uses as much as digits as its factorization.

1247912461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 1247912461 is about 35325.8044635929. The cubic root of 1247912461 is about 1076.6173486959.

The spelling of 1247912461 in words is "one billion, two hundred forty-seven million, nine hundred twelve thousand, four hundred sixty-one".