1240417681 has 2 divisors, whose sum is σ = 1240417682. Its totient is φ = 1240417680.

The previous prime is 1240417657. The next prime is 1240417687. The reversal of 1240417681 is 1867140421.

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., 1021377681 + 219040000 = 31959^2 + 14800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240417681 - 2¹¹ = 1240415633 is a prime.

It is a super-2 number, since 2×1240417681² = 3077272046674835522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1240417687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620208840 + 620208841.

It is an arithmetic number, because the mean of its divisors is an integer number (620208841).

Almost surely, 2^1240417681 is an apocalyptic number.

It is an amenable number.

1240417681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240417681 is an equidigital number, since it uses as much as digits as its factorization.

1240417681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1240417681 is about 35219.5638956532. The cubic root of 1240417681 is about 1074.4576838406.

The spelling of 1240417681 in words is "one billion, two hundred forty million, four hundred seventeen thousand, six hundred eighty-one".