1247266051 has 2 divisors, whose sum is σ = 1247266052. Its totient is φ = 1247266050.

The previous prime is 1247266049. The next prime is 1247266073. The reversal of 1247266051 is 1506627421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1247266051 - 2¹ = 1247266049 is a prime.

Together with 1247266049, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1247265998 and 1247266016.

It is not a weakly prime, because it can be changed into another prime (1247266351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623633025 + 623633026.

It is an arithmetic number, because the mean of its divisors is an integer number (623633026).

Almost surely, 2^1247266051 is an apocalyptic number.

1247266051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247266051 is an equidigital number, since it uses as much as digits as its factorization.

1247266051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1247266051 is about 35316.6540176161. The cubic root of 1247266051 is about 1076.4314231496.

The spelling of 1247266051 in words is "one billion, two hundred forty-seven million, two hundred sixty-six thousand, fifty-one".