1921174949 has 4 divisors (see below), whose sum is σ = 2022289440. Its totient is φ = 1820060460.

The previous prime is 1921174943. The next prime is 1921174967. The reversal of 1921174949 is 9494711291.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 9494711291 = 13 ⋅730362407.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921174949 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 (1921174943) 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, 50557217 + ... + 50557254.

It is an arithmetic number, because the mean of its divisors is an integer number (505572360).

Almost surely, 2^1921174949 is an apocalyptic number.

1921174949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1921174949 is a deficient number, since it is larger than the sum of its proper divisors (101114491).

1921174949 is a wasteful number, since it uses less digits than its factorization.

1921174949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101114490.

The product of its digits is 163296, while the sum is 47.

The square root of 1921174949 is about 43831.2097597135. The cubic root of 1921174949 is about 1243.1464812194.

The spelling of 1921174949 in words is "one billion, nine hundred twenty-one million, one hundred seventy-four thousand, nine hundred forty-nine".