1251036402 has 64 divisors (see below), whose sum is σ = 3125606400. Its totient is φ = 324305280.

The previous prime is 1251036383. The next prime is 1251036407. The reversal of 1251036402 is 2046301521.

It is not an unprimeable number, because it can be changed into a prime (1251036407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260499 + ... + 265257.

It is an arithmetic number, because the mean of its divisors is an integer number (48837600).

Almost surely, 2^1251036402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251036402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562803200).

1251036402 is an abundant number, since it is smaller than the sum of its proper divisors (1874569998).

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

1251036402 is a wasteful number, since it uses less digits than its factorization.

1251036402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1251036402 is about 35369.9929601350. The cubic root of 1251036402 is about 1077.5149774961.

Adding to 1251036402 its reverse (2046301521), we get a palindrome (3297337923).

The spelling of 1251036402 in words is "one billion, two hundred fifty-one million, thirty-six thousand, four hundred two".