99309401861 has 4 divisors (see below), whose sum is σ = 99310129632. Its totient is φ = 99308674092.

The previous prime is 99309401813. The next prime is 99309401869. The reversal of 99309401861 is 16810490399.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16810490399 = 101 ⋅166440499.

It is a cyclic number.

It is not a de Polignac number, because 99309401861 - 2¹⁴ = 99309385477 is a prime.

It is a deceptive number, since it divides R_99309401860.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99309401869) 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, 90971 + ... + 454856.

It is an arithmetic number, because the mean of its divisors is an integer number (24827532408).

It is a Poulet number, since it divides 2^99309401860-1.

Almost surely, 2^99309401861 is an apocalyptic number.

99309401861 is the 181943-rd octagonal number.

It is an amenable number.

99309401861 is a deficient number, since it is larger than the sum of its proper divisors (727771).

99309401861 is a wasteful number, since it uses less digits than its factorization.

99309401861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727770.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 99309401861 in words is "ninety-nine billion, three hundred nine million, four hundred one thousand, eight hundred sixty-one".