919072057 has 4 divisors (see below), whose sum is σ = 922885876. Its totient is φ = 915258240.

The previous prime is 919072013. The next prime is 919072069. The reversal of 919072057 is 750270919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750270919 = 29 ⋅25871411.

It can be written as a sum of positive squares in 2 ways, for example, as 499477801 + 419594256 = 22349^2 + 20484^2 .

It is a cyclic number.

It is not a de Polignac number, because 919072057 - 2⁷ = 919071929 is a prime.

It is a super-2 number, since 2×919072057² = 1689386891916422498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919072757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906548 + ... + 1907029.

It is an arithmetic number, because the mean of its divisors is an integer number (230721469).

Almost surely, 2^919072057 is an apocalyptic number.

It is an amenable number.

919072057 is a deficient number, since it is larger than the sum of its proper divisors (3813819).

919072057 is a wasteful number, since it uses less digits than its factorization.

919072057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3813818.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 919072057 is about 30316.2012297055. The cubic root of 919072057 is about 972.2617209303.

The spelling of 919072057 in words is "nine hundred nineteen million, seventy-two thousand, fifty-seven".