3891097901 has 2 divisors, whose sum is σ = 3891097902. Its totient is φ = 3891097900.

The previous prime is 3891097879. The next prime is 3891097909. The reversal of 3891097901 is 1097901983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2168764900 + 1722333001 = 46570^2 + 41501^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891097901 - 2¹⁴ = 3891081517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891097909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945548950 + 1945548951.

It is an arithmetic number, because the mean of its divisors is an integer number (1945548951).

Almost surely, 2^3891097901 is an apocalyptic number.

It is an amenable number.

3891097901 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891097901 is an equidigital number, since it uses as much as digits as its factorization.

3891097901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 3891097901 is about 62378.6654313797. The cubic root of 3891097901 is about 1572.8623592634.

The spelling of 3891097901 in words is "three billion, eight hundred ninety-one million, ninety-seven thousand, nine hundred one".