919778820601 has 9 divisors (see below), whose sum is σ = 926980249359. Its totient is φ = 912632931600.

The previous prime is 919778820593. The next prime is 919778820673. The reversal of 919778820601 is 106028877919.

The square root of 919778820601 is 959051.

It is a perfect power (a square), and thus also a powerful number.

919778820601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 251254201 + 919527566400 = 15851^2 + 958920^2 .

It is not a de Polignac number, because 919778820601 - 2³ = 919778820593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919778820691) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 125632021 + ... + 125639341.

Almost surely, 2^919778820601 is an apocalyptic number.

919778820601 is the 959051-st square number.

919778820601 is the 479526-th centered octagonal number.

It is an amenable number.

919778820601 is a deficient number, since it is larger than the sum of its proper divisors (7201428758).

919778820601 is an frugal number, since it uses more digits than its factorization.

919778820601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14904 (or 7452 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 58.

The spelling of 919778820601 in words is "nine hundred nineteen billion, seven hundred seventy-eight million, eight hundred twenty thousand, six hundred one".