1240899061 has 2 divisors, whose sum is σ = 1240899062. Its totient is φ = 1240899060.

The previous prime is 1240899043. The next prime is 1240899089. The reversal of 1240899061 is 1609980421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981882225 + 259016836 = 31335^2 + 16094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240899061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240899661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620449530 + 620449531.

It is an arithmetic number, because the mean of its divisors is an integer number (620449531).

Almost surely, 2^1240899061 is an apocalyptic number.

It is an amenable number.

1240899061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240899061 is an equidigital number, since it uses as much as digits as its factorization.

1240899061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1240899061 is about 35226.3972185632. The cubic root of 1240899061 is about 1074.5966573371.

The spelling of 1240899061 in words is "one billion, two hundred forty million, eight hundred ninety-nine thousand, sixty-one".