771541649 has 16 divisors (see below), whose sum is σ = 823944576. Its totient is φ = 721353600.

The previous prime is 771541577. The next prime is 771541657. The reversal of 771541649 is 946145177.

It is a cyclic number.

It is not a de Polignac number, because 771541649 - 2¹⁶ = 771476113 is a prime.

It is a super-2 number, since 2×771541649² = 1190553032283278402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (771541679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97844 + ... + 105434.

It is an arithmetic number, because the mean of its divisors is an integer number (51496536).

Almost surely, 2^771541649 is an apocalyptic number.

It is an amenable number.

771541649 is a deficient number, since it is larger than the sum of its proper divisors (52402927).

771541649 is a wasteful number, since it uses less digits than its factorization.

771541649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7736.

The product of its digits is 211680, while the sum is 44.

The square root of 771541649 is about 27776.6385475277. The cubic root of 771541649 is about 917.1769357077.

The spelling of 771541649 in words is "seven hundred seventy-one million, five hundred forty-one thousand, six hundred forty-nine".