1285491250 has 20 divisors (see below), whose sum is σ = 2409527142. Its totient is φ = 514196000.

The previous prime is 1285491209. The next prime is 1285491253. The reversal of 1285491250 is 521945821.

It can be written as a sum of positive squares in 5 ways, for example, as 59861169 + 1225630081 = 7737^2 + 35009^2 .

It is a super-3 number, since 3×1285491250³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1285491253) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 512947 + ... + 515446.

Almost surely, 2^1285491250 is an apocalyptic number.

1285491250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1285491250 is a deficient number, since it is larger than the sum of its proper divisors (1124035892).

1285491250 is an equidigital number, since it uses as much as digits as its factorization.

1285491250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028415 (or 1028400 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1285491250 is about 35853.7480606979. The cubic root of 1285491250 is about 1087.3174926035.

The spelling of 1285491250 in words is "one billion, two hundred eighty-five million, four hundred ninety-one thousand, two hundred fifty".