40120251251 has 4 divisors (see below), whose sum is σ = 40124037192. Its totient is φ = 40116465312.

The previous prime is 40120251203. The next prime is 40120251253. The reversal of 40120251251 is 15215202104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40120251251 - 2¹⁰ = 40120250227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40120251253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1877030 + ... + 1898283.

It is an arithmetic number, because the mean of its divisors is an integer number (10031009298).

Almost surely, 2^40120251251 is an apocalyptic number.

40120251251 is a deficient number, since it is larger than the sum of its proper divisors (3785941).

40120251251 is a wasteful number, since it uses less digits than its factorization.

40120251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785940.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 40120251251 its reverse (15215202104), we get a palindrome (55335453355).

The spelling of 40120251251 in words is "forty billion, one hundred twenty million, two hundred fifty-one thousand, two hundred fifty-one".