748931621 has 2 divisors, whose sum is σ = 748931622. Its totient is φ = 748931620.

The previous prime is 748931593. The next prime is 748931633. The reversal of 748931621 is 126139847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634334596 + 114597025 = 25186^2 + 10705^2 .

It is a cyclic number.

It is not a de Polignac number, because 748931621 - 2²² = 744737317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (748931321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374465810 + 374465811.

It is an arithmetic number, because the mean of its divisors is an integer number (374465811).

Almost surely, 2^748931621 is an apocalyptic number.

It is an amenable number.

748931621 is a deficient number, since it is larger than the sum of its proper divisors (1).

748931621 is an equidigital number, since it uses as much as digits as its factorization.

748931621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 748931621 is about 27366.6150811532. The cubic root of 748931621 is about 908.1286750729.

The spelling of 748931621 in words is "seven hundred forty-eight million, nine hundred thirty-one thousand, six hundred twenty-one".