1290061901 has 4 divisors (see below), whose sum is σ = 1301478492. Its totient is φ = 1278645312.

The previous prime is 1290061889. The next prime is 1290061909. The reversal of 1290061901 is 1091600921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10569001 + 1279492900 = 3251^2 + 35770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290061901 - 2⁶ = 1290061837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290061909) 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, 5708126 + ... + 5708351.

It is an arithmetic number, because the mean of its divisors is an integer number (325369623).

Almost surely, 2^1290061901 is an apocalyptic number.

It is an amenable number.

1290061901 is a deficient number, since it is larger than the sum of its proper divisors (11416591).

1290061901 is a wasteful number, since it uses less digits than its factorization.

1290061901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416590.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 1290061901 is about 35917.4317149765. The cubic root of 1290061901 is about 1088.6046452257.

The spelling of 1290061901 in words is "one billion, two hundred ninety million, sixty-one thousand, nine hundred one".