772216129 has 4 divisors (see below), whose sum is σ = 775152576. Its totient is φ = 769279684.

The previous prime is 772216087. The next prime is 772216139. The reversal of 772216129 is 921612277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921612277 = 23 ⋅40070099.

It is a cyclic number.

It is not a de Polignac number, because 772216129 - 2²¹ = 770118977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772216139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1467829 + ... + 1468354.

It is an arithmetic number, because the mean of its divisors is an integer number (193788144).

Almost surely, 2^772216129 is an apocalyptic number.

It is an amenable number.

772216129 is a deficient number, since it is larger than the sum of its proper divisors (2936447).

772216129 is a wasteful number, since it uses less digits than its factorization.

772216129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936446.

The product of its digits is 21168, while the sum is 37.

The square root of 772216129 is about 27788.7770331837. Note that the first 3 decimals coincide. The cubic root of 772216129 is about 917.4441225464. Note that the first 3 decimals are identical.

The spelling of 772216129 in words is "seven hundred seventy-two million, two hundred sixteen thousand, one hundred twenty-nine".