1251232361 has 32 divisors (see below), whose sum is σ = 1375875072. Its totient is φ = 1134745920.

The previous prime is 1251232349. The next prime is 1251232373. The reversal of 1251232361 is 1632321521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1251232349) and next prime (1251232373).

It is not a de Polignac number, because 1251232361 - 2²² = 1247038057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251232361.

It is not an unprimeable number, because it can be changed into a prime (1251222361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7232471 + ... + 7232643.

It is an arithmetic number, because the mean of its divisors is an integer number (42996096).

Almost surely, 2^1251232361 is an apocalyptic number.

It is an amenable number.

1251232361 is a deficient number, since it is larger than the sum of its proper divisors (124642711).

1251232361 is a wasteful number, since it uses less digits than its factorization.

1251232361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its digits is 2160, while the sum is 26.

The square root of 1251232361 is about 35372.7629822721. The cubic root of 1251232361 is about 1077.5712342481.

Adding to 1251232361 its reverse (1632321521), we get a palindrome (2883553882).

The spelling of 1251232361 in words is "one billion, two hundred fifty-one million, two hundred thirty-two thousand, three hundred sixty-one".