40357561 has 2 divisors, whose sum is σ = 40357562. Its totient is φ = 40357560.

The previous prime is 40357553. The next prime is 40357573. The reversal of 40357561 is 16575304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28558336 + 11799225 = 5344^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 40357561 - 2³ = 40357553 is a prime.

It is not a weakly prime, because it can be changed into another prime (40357061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20178780 + 20178781.

It is an arithmetic number, because the mean of its divisors is an integer number (20178781).

Almost surely, 2^40357561 is an apocalyptic number.

It is an amenable number.

40357561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40357561 is an equidigital number, since it uses as much as digits as its factorization.

40357561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 40357561 is about 6352.7601088031. The cubic root of 40357561 is about 343.0112024493.

The spelling of 40357561 in words is "forty million, three hundred fifty-seven thousand, five hundred sixty-one".