1251501881492 has 6 divisors (see below), whose sum is σ = 2190128292618. Its totient is φ = 625750940744.

The previous prime is 1251501881489. The next prime is 1251501881503. The reversal of 1251501881492 is 2941881051521.

It can be written as a sum of positive squares in only one way, i.e., 669461058436 + 582040823056 = 818206^2 + 762916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156437735183 + ... + 156437735190.

It is an arithmetic number, because the mean of its divisors is an integer number (365021382103).

Almost surely, 2^{1251501881492} is an apocalyptic number.

It is an amenable number.

1251501881492 is a deficient number, since it is larger than the sum of its proper divisors (938626411126).

1251501881492 is a wasteful number, since it uses less digits than its factorization.

1251501881492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312875470377 (or 312875470375 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 47.

The spelling of 1251501881492 in words is "one trillion, two hundred fifty-one billion, five hundred one million, eight hundred eighty-one thousand, four hundred ninety-two".