945155721 has 16 divisors (see below), whose sum is σ = 1321251840. Its totient is φ = 599842320.

The previous prime is 945155719. The next prime is 945155737. The reversal of 945155721 is 127551549.

It is not a de Polignac number, because 945155721 - 2¹ = 945155719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 945155721.

It is not an unprimeable number, because it can be changed into a prime (945155711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17901 + ... + 47018.

It is an arithmetic number, because the mean of its divisors is an integer number (82578240).

Almost surely, 2^945155721 is an apocalyptic number.

It is an amenable number.

945155721 is a deficient number, since it is larger than the sum of its proper divisors (376096119).

945155721 is a wasteful number, since it uses less digits than its factorization.

945155721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65156.

The product of its digits is 63000, while the sum is 39.

The square root of 945155721 is about 30743.3849958003. The cubic root of 945155721 is about 981.3737920767.

The spelling of 945155721 in words is "nine hundred forty-five million, one hundred fifty-five thousand, seven hundred twenty-one".