1090156621 has 2 divisors, whose sum is σ = 1090156622. Its totient is φ = 1090156620.

The previous prime is 1090156607. The next prime is 1090156631. The reversal of 1090156621 is 1266510901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020099721 + 70056900 = 31939^2 + 8370^2 .

It is an emirp because it is prime and its reverse (1266510901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1090156621 - 2⁵ = 1090156589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1090156631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545078310 + 545078311.

It is an arithmetic number, because the mean of its divisors is an integer number (545078311).

Almost surely, 2^1090156621 is an apocalyptic number.

It is an amenable number.

1090156621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090156621 is an equidigital number, since it uses as much as digits as its factorization.

1090156621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1090156621 is about 33017.5199098903. The cubic root of 1090156621 is about 1029.1917563583.

The spelling of 1090156621 in words is "one billion, ninety million, one hundred fifty-six thousand, six hundred twenty-one".