1925721737 has 2 divisors, whose sum is σ = 1925721738. Its totient is φ = 1925721736.

The previous prime is 1925721727. The next prime is 1925721739. The reversal of 1925721737 is 7371275291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1511965456 + 413756281 = 38884^2 + 20341^2 .

It is a cyclic number.

It is not a de Polignac number, because 1925721737 - 2¹² = 1925717641 is a prime.

Together with 1925721739, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1925721739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962860868 + 962860869.

It is an arithmetic number, because the mean of its divisors is an integer number (962860869).

Almost surely, 2^1925721737 is an apocalyptic number.

It is an amenable number.

1925721737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1925721737 is an equidigital number, since it uses as much as digits as its factorization.

1925721737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 44.

The square root of 1925721737 is about 43883.0461226201. The cubic root of 1925721737 is about 1244.1264145838.

The spelling of 1925721737 in words is "one billion, nine hundred twenty-five million, seven hundred twenty-one thousand, seven hundred thirty-seven".