945757721 has 2 divisors, whose sum is σ = 945757722. Its totient is φ = 945757720.

The previous prime is 945757711. The next prime is 945757727. The reversal of 945757721 is 127757549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 909625600 + 36132121 = 30160^2 + 6011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-945757721 is a prime.

It is a super-2 number, since 2×945757721² = 1788915333662227682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (945757727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472878860 + 472878861.

It is an arithmetic number, because the mean of its divisors is an integer number (472878861).

Almost surely, 2^945757721 is an apocalyptic number.

It is an amenable number.

945757721 is a deficient number, since it is larger than the sum of its proper divisors (1).

945757721 is an equidigital number, since it uses as much as digits as its factorization.

945757721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 617400, while the sum is 47.

The square root of 945757721 is about 30753.1741613772. The cubic root of 945757721 is about 981.5821040066.

The spelling of 945757721 in words is "nine hundred forty-five million, seven hundred fifty-seven thousand, seven hundred twenty-one".