572216991 has 32 divisors (see below), whose sum is σ = 829543680. Its totient is φ = 349499904.

The previous prime is 572216989. The next prime is 572217001. The reversal of 572216991 is 199612275.

It is not a de Polignac number, because 572216991 - 2¹ = 572216989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (572216291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374956 + ... + 376478.

It is an arithmetic number, because the mean of its divisors is an integer number (25923240).

Almost surely, 2^572216991 is an apocalyptic number.

572216991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

572216991 is a deficient number, since it is larger than the sum of its proper divisors (257326689).

572216991 is a wasteful number, since it uses less digits than its factorization.

572216991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its digits is 68040, while the sum is 42.

The square root of 572216991 is about 23921.0574808055. The cubic root of 572216991 is about 830.2080046735.

The spelling of 572216991 in words is "five hundred seventy-two million, two hundred sixteen thousand, nine hundred ninety-one".