9139901261 has 18 divisors (see below), whose sum is σ = 9713739870. Its totient is φ = 8589611520.

The previous prime is 9139901143. The next prime is 9139901263. The reversal of 9139901261 is 1621099319.

It can be written as a sum of positive squares in 9 ways, for example, as 8839572361 + 300328900 = 94019^2 + 17330^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9139901261 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9139901263) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21108101 + ... + 21108533.

It is an arithmetic number, because the mean of its divisors is an integer number (539652215).

Almost surely, 2^9139901261 is an apocalyptic number.

It is an amenable number.

9139901261 is a deficient number, since it is larger than the sum of its proper divisors (573838609).

9139901261 is an frugal number, since it uses more digits than its factorization.

9139901261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 9139901261 is about 95602.8308210589. The cubic root of 9139901261 is about 2090.8064667734.

The spelling of 9139901261 in words is "nine billion, one hundred thirty-nine million, nine hundred one thousand, two hundred sixty-one".