1285257901 has 2 divisors, whose sum is σ = 1285257902. Its totient is φ = 1285257900.

The previous prime is 1285257893. The next prime is 1285257943. The reversal of 1285257901 is 1097525821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1283502276 + 1755625 = 35826^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285257901 - 2³ = 1285257893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285257971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642628950 + 642628951.

It is an arithmetic number, because the mean of its divisors is an integer number (642628951).

Almost surely, 2^1285257901 is an apocalyptic number.

It is an amenable number.

1285257901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285257901 is an equidigital number, since it uses as much as digits as its factorization.

1285257901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 1285257901 is about 35850.4937343965. The cubic root of 1285257901 is about 1087.2516967962.

The spelling of 1285257901 in words is "one billion, two hundred eighty-five million, two hundred fifty-seven thousand, nine hundred one".