1265220403 has 2 divisors, whose sum is σ = 1265220404. Its totient is φ = 1265220402.

The previous prime is 1265220349. The next prime is 1265220419. The reversal of 1265220403 is 3040225621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265220403 - 2²⁹ = 728349491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265220503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632610201 + 632610202.

It is an arithmetic number, because the mean of its divisors is an integer number (632610202).

Almost surely, 2^1265220403 is an apocalyptic number.

1265220403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265220403 is an equidigital number, since it uses as much as digits as its factorization.

1265220403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1265220403 is about 35569.9367865618. The cubic root of 1265220403 is about 1081.5719002902.

The spelling of 1265220403 in words is "one billion, two hundred sixty-five million, two hundred twenty thousand, four hundred three".