1247972641 has 2 divisors, whose sum is σ = 1247972642. Its totient is φ = 1247972640.

The previous prime is 1247972599. The next prime is 1247972659. The reversal of 1247972641 is 1462797421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246372416 + 1600225 = 35304^2 + 1265^2 .

It is an emirp because it is prime and its reverse (1462797421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1247972641 - 2¹³ = 1247964449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247972681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623986320 + 623986321.

It is an arithmetic number, because the mean of its divisors is an integer number (623986321).

Almost surely, 2^1247972641 is an apocalyptic number.

It is an amenable number.

1247972641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247972641 is an equidigital number, since it uses as much as digits as its factorization.

1247972641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 1247972641 is about 35326.6562385969. The cubic root of 1247972641 is about 1076.6346548753.

The spelling of 1247972641 in words is "one billion, two hundred forty-seven million, nine hundred seventy-two thousand, six hundred forty-one".