1949312101 has 4 divisors (see below), whose sum is σ = 2126522304. Its totient is φ = 1772101900.

The previous prime is 1949312081. The next prime is 1949312117. The reversal of 1949312101 is 1012139491.

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.

It is a cyclic number.

It is not a de Polignac number, because 1949312101 - 2¹⁷ = 1949181029 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949312161) 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, 88605085 + ... + 88605106.

It is an arithmetic number, because the mean of its divisors is an integer number (531630576).

Almost surely, 2^1949312101 is an apocalyptic number.

1949312101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1949312101 is a deficient number, since it is larger than the sum of its proper divisors (177210203).

1949312101 is a wasteful number, since it uses less digits than its factorization.

1949312101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177210202.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1949312101 is about 44151.0147222009. The cubic root of 1949312101 is about 1249.1860516522.

The spelling of 1949312101 in words is "one billion, nine hundred forty-nine million, three hundred twelve thousand, one hundred one".