1097850661 has 2 divisors, whose sum is σ = 1097850662. Its totient is φ = 1097850660.

The previous prime is 1097850617. The next prime is 1097850683. The reversal of 1097850661 is 1660587901.

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., 593848161 + 504002500 = 24369^2 + 22450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1097850661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1097854661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548925330 + 548925331.

It is an arithmetic number, because the mean of its divisors is an integer number (548925331).

Almost surely, 2^1097850661 is an apocalyptic number.

It is an amenable number.

1097850661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097850661 is an equidigital number, since it uses as much as digits as its factorization.

1097850661 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 1097850661 is about 33133.8295553050. The cubic root of 1097850661 is about 1031.6073377088.

The spelling of 1097850661 in words is "one billion, ninety-seven million, eight hundred fifty thousand, six hundred sixty-one".