40779961 has 2 divisors, whose sum is σ = 40779962. Its totient is φ = 40779960.

The previous prime is 40779929. The next prime is 40779967. The reversal of 40779961 is 16997704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 20250000 = 4531^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 40779961 - 2⁵ = 40779929 is a prime.

It is not a weakly prime, because it can be changed into another prime (40779967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20389980 + 20389981.

It is an arithmetic number, because the mean of its divisors is an integer number (20389981).

Almost surely, 2^40779961 is an apocalyptic number.

It is an amenable number.

40779961 is a deficient number, since it is larger than the sum of its proper divisors (1).

40779961 is an equidigital number, since it uses as much as digits as its factorization.

40779961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 40779961 is about 6385.9189628432. The cubic root of 40779961 is about 344.2037535704.

The spelling of 40779961 in words is "forty million, seven hundred seventy-nine thousand, nine hundred sixty-one".