2399561901 has 20 divisors (see below), whose sum is σ = 3910398624. Its totient is φ = 1454279400.

The previous prime is 2399561891. The next prime is 2399561911. The reversal of 2399561901 is 1091659932.

It is a happy number.

2399561901 is a `hidden beast` number, since 23 + 9 + 9 + 5 + 619 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2399561891) and next prime (2399561911).

It is not a de Polignac number, because 2399561901 - 2⁵ = 2399561869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399561911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1345665 + ... + 1347446.

Almost surely, 2^2399561901 is an apocalyptic number.

It is an amenable number.

2399561901 is a deficient number, since it is larger than the sum of its proper divisors (1510836723).

2399561901 is a wasteful number, since it uses less digits than its factorization.

2399561901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693134 (or 2693125 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 2399561901 is about 48985.3233223993. The cubic root of 2399561901 is about 1338.7844291219.

The spelling of 2399561901 in words is "two billion, three hundred ninety-nine million, five hundred sixty-one thousand, nine hundred one".