1260521901 has 6 divisors (see below), whose sum is σ = 1820753870. Its totient is φ = 840347928.

The previous prime is 1260521897. The next prime is 1260521929. The reversal of 1260521901 is 1091250621.

It can be written as a sum of positive squares in only one way, i.e., 1225700100 + 34821801 = 35010^2 + 5901^2 .

It is not a de Polignac number, because 1260521901 - 2² = 1260521897 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 (1260528901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70028986 + ... + 70029003.

Almost surely, 2^1260521901 is an apocalyptic number.

It is an amenable number.

1260521901 is a deficient number, since it is larger than the sum of its proper divisors (560231969).

1260521901 is a wasteful number, since it uses less digits than its factorization.

1260521901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140057995 (or 140057992 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1260521901 is about 35503.8293850114. The cubic root of 1260521901 is about 1080.2314036046.

The spelling of 1260521901 in words is "one billion, two hundred sixty million, five hundred twenty-one thousand, nine hundred one".