1245221544 has 64 divisors (see below), whose sum is σ = 3745036800. Its totient is φ = 337051584.

The previous prime is 1245221539. The next prime is 1245221557. The reversal of 1245221544 is 4451225421.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191862 + ... + 198245.

It is an arithmetic number, because the mean of its divisors is an integer number (58516200).

Almost surely, 2^1245221544 is an apocalyptic number.

1245221544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1245221544 is an abundant number, since it is smaller than the sum of its proper divisors (2499815256).

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

1245221544 is a wasteful number, since it uses less digits than its factorization.

1245221544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390142 (or 390138 counting only the distinct ones).

The product of its digits is 12800, while the sum is 30.

The square root of 1245221544 is about 35287.6967794726. The cubic root of 1245221544 is about 1075.8429426702.

Adding to 1245221544 its reverse (4451225421), we get a palindrome (5696446965).

The spelling of 1245221544 in words is "one billion, two hundred forty-five million, two hundred twenty-one thousand, five hundred forty-four".