40121251 has 2 divisors, whose sum is σ = 40121252. Its totient is φ = 40121250.

The previous prime is 40121243. The next prime is 40121261. The reversal of 40121251 is 15212104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40121251 - 2³ = 40121243 is a prime.

It is not a weakly prime, because it can be changed into another prime (40121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060625 + 20060626.

It is an arithmetic number, because the mean of its divisors is an integer number (20060626).

Almost surely, 2^40121251 is an apocalyptic number.

40121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121251 is an equidigital number, since it uses as much as digits as its factorization.

40121251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 40121251 is about 6334.1338002919. The cubic root of 40121251 is about 342.3404012484.

Adding to 40121251 its reverse (15212104), we get a palindrome (55333355).

The spelling of 40121251 in words is "forty million, one hundred twenty-one thousand, two hundred fifty-one".