391190062261 has 4 divisors (see below), whose sum is σ = 414201242412. Its totient is φ = 368178882112.

The previous prime is 391190062247. The next prime is 391190062303. The reversal of 391190062261 is 162260091193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162260091193 = 307 ⋅528534499.

It can be written as a sum of positive squares in 2 ways, for example, as 329372688100 + 61817374161 = 573910^2 + 248631^2 .

It is a cyclic number.

It is not a de Polignac number, because 391190062261 - 2¹⁵ = 391190029493 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 (391190062061) 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, 11505590050 + ... + 11505590083.

It is an arithmetic number, because the mean of its divisors is an integer number (103550310603).

Almost surely, 2^391190062261 is an apocalyptic number.

It is an amenable number.

391190062261 is a deficient number, since it is larger than the sum of its proper divisors (23011180151).

391190062261 is a wasteful number, since it uses less digits than its factorization.

391190062261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23011180150.

The product of its (nonzero) digits is 34992, while the sum is 40.

The spelling of 391190062261 in words is "three hundred ninety-one billion, one hundred ninety million, sixty-two thousand, two hundred sixty-one".