40205651 has 2 divisors, whose sum is σ = 40205652. Its totient is φ = 40205650.

The previous prime is 40205621. The next prime is 40205657. The reversal of 40205651 is 15650204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40205651 is a prime.

It is not a weakly prime, because it can be changed into another prime (40205657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102825 + 20102826.

It is an arithmetic number, because the mean of its divisors is an integer number (20102826).

Almost surely, 2^40205651 is an apocalyptic number.

40205651 is a deficient number, since it is larger than the sum of its proper divisors (1).

40205651 is an equidigital number, since it uses as much as digits as its factorization.

40205651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 40205651 is about 6340.7926160694. The cubic root of 40205651 is about 342.5802848713.

Adding to 40205651 its reverse (15650204), we get a palindrome (55855855).

The spelling of 40205651 in words is "forty million, two hundred five thousand, six hundred fifty-one".