1265909951 has 2 divisors, whose sum is σ = 1265909952. Its totient is φ = 1265909950.

The previous prime is 1265909921. The next prime is 1265909969. The reversal of 1265909951 is 1599095621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1599095621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265909951 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265909896 and 1265909905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265909921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632954975 + 632954976.

It is an arithmetic number, because the mean of its divisors is an integer number (632954976).

Almost surely, 2^1265909951 is an apocalyptic number.

1265909951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265909951 is an equidigital number, since it uses as much as digits as its factorization.

1265909951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 47.

The square root of 1265909951 is about 35579.6283145285. The cubic root of 1265909951 is about 1081.7683509885.

The spelling of 1265909951 in words is "one billion, two hundred sixty-five million, nine hundred nine thousand, nine hundred fifty-one".