1921550437 has 2 divisors, whose sum is σ = 1921550438. Its totient is φ = 1921550436.

The previous prime is 1921550369. The next prime is 1921550441. The reversal of 1921550437 is 7340551291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025984961 + 895565476 = 32031^2 + 29926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921550437 - 2¹⁵ = 1921517669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921550396 and 1921550405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921550537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960775218 + 960775219.

It is an arithmetic number, because the mean of its divisors is an integer number (960775219).

Almost surely, 2^1921550437 is an apocalyptic number.

It is an amenable number.

1921550437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921550437 is an equidigital number, since it uses as much as digits as its factorization.

1921550437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 1921550437 is about 43835.4928910352. The cubic root of 1921550437 is about 1243.2274657195.

The spelling of 1921550437 in words is "one billion, nine hundred twenty-one million, five hundred fifty thousand, four hundred thirty-seven".