3900985298091 has 54 divisors (see below), whose sum is σ = 6900021673740. Its totient is φ = 2111713716672.

The previous prime is 3900985298087. The next prime is 3900985298107. The reversal of 3900985298091 is 1908925890093.

3900985298091 is a `hidden beast` number, since 390 + 0 + 9 + 85 + 2 + 9 + 80 + 91 = 666.

It is not a de Polignac number, because 3900985298091 - 2² = 3900985298087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (3900985298081) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 180782895 + ... + 180804471.

Almost surely, 2^{3900985298091} is an apocalyptic number.

3900985298091 is a deficient number, since it is larger than the sum of its proper divisors (2999036375649).

3900985298091 is an frugal number, since it uses more digits than its factorization.

3900985298091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43193 (or 21606 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The spelling of 3900985298091 in words is "three trillion, nine hundred billion, nine hundred eighty-five million, two hundred ninety-eight thousand, ninety-one".