1211257450 has 24 divisors (see below), whose sum is σ = 2426243148. Its totient is φ = 447233280.

The previous prime is 1211257417. The next prime is 1211257457. The reversal of 1211257450 is 547521121.

It can be written as a sum of positive squares in 6 ways, for example, as 342953361 + 868304089 = 18519^2 + 29467^2 .

It is a super-2 number, since 2×1211257450² = 2934289220361005000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211257457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931087 + ... + 932386.

Almost surely, 2^1211257450 is an apocalyptic number.

1211257450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211257450 is an abundant number, since it is smaller than the sum of its proper divisors (1214985698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211257450 is a wasteful number, since it uses less digits than its factorization.

1211257450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863498 (or 1863493 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1211257450 is about 34803.1241413756. The cubic root of 1211257450 is about 1065.9712388708.

Adding to 1211257450 its reverse (547521121), we get a palindrome (1758778571).

The spelling of 1211257450 in words is "one billion, two hundred eleven million, two hundred fifty-seven thousand, four hundred fifty".