1540890097 has 2 divisors, whose sum is σ = 1540890098. Its totient is φ = 1540890096.

The previous prime is 1540890007. The next prime is 1540890119. The reversal of 1540890097 is 7900980451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778633216 + 762256881 = 27904^2 + 27609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540890097 - 2⁷ = 1540889969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540890007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770445048 + 770445049.

It is an arithmetic number, because the mean of its divisors is an integer number (770445049).

Almost surely, 2^1540890097 is an apocalyptic number.

It is an amenable number.

1540890097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540890097 is an equidigital number, since it uses as much as digits as its factorization.

1540890097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 1540890097 is about 39254.1729883588. The cubic root of 1540890097 is about 1155.0227932260.

The spelling of 1540890097 in words is "one billion, five hundred forty million, eight hundred ninety thousand, ninety-seven".