919948261 has 4 divisors (see below), whose sum is σ = 920809900. Its totient is φ = 919086624.

The previous prime is 919948243. The next prime is 919948297. The reversal of 919948261 is 162849919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162849919 = 17 ⋅9579407.

It can be written as a sum of positive squares in 2 ways, for example, as 396408100 + 523540161 = 19910^2 + 22881^2 .

It is a cyclic number.

It is not a de Polignac number, because 919948261 - 2²⁵ = 886393829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919948361) 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, 429216 + ... + 431353.

It is an arithmetic number, because the mean of its divisors is an integer number (230202475).

Almost surely, 2^919948261 is an apocalyptic number.

It is an amenable number.

919948261 is a deficient number, since it is larger than the sum of its proper divisors (861639).

919948261 is a wasteful number, since it uses less digits than its factorization.

919948261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861638.

The product of its digits is 279936, while the sum is 49.

The square root of 919948261 is about 30330.6488720568. The cubic root of 919948261 is about 972.5705937128.

The spelling of 919948261 in words is "nine hundred nineteen million, nine hundred forty-eight thousand, two hundred sixty-one".