1921055137 has 2 divisors, whose sum is σ = 1921055138. Its totient is φ = 1921055136.

The previous prime is 1921055107. The next prime is 1921055159. The reversal of 1921055137 is 7315501291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918352401 + 2702736 = 43799^2 + 1644^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921055137 - 2⁷ = 1921055009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921055107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960527568 + 960527569.

It is an arithmetic number, because the mean of its divisors is an integer number (960527569).

Almost surely, 2^1921055137 is an apocalyptic number.

It is an amenable number.

1921055137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921055137 is an equidigital number, since it uses as much as digits as its factorization.

1921055137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 1921055137 is about 43829.8429953839. The cubic root of 1921055137 is about 1243.1206381864.

It can be divided in two parts, 19210 and 55137, that added together give a palindrome (74347).

The spelling of 1921055137 in words is "one billion, nine hundred twenty-one million, fifty-five thousand, one hundred thirty-seven".