1921479031 has 2 divisors, whose sum is σ = 1921479032. Its totient is φ = 1921479030.

The previous prime is 1921479029. The next prime is 1921479047. The reversal of 1921479031 is 1309741291.

It is a weak prime.

It is an emirp because it is prime and its reverse (1309741291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921479031 - 2¹ = 1921479029 is a prime.

It is a super-2 number, since 2×1921479031² = 7384163333145397922, which contains 22 as substring.

Together with 1921479029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921479011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960739515 + 960739516.

It is an arithmetic number, because the mean of its divisors is an integer number (960739516).

Almost surely, 2^1921479031 is an apocalyptic number.

1921479031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921479031 is an equidigital number, since it uses as much as digits as its factorization.

1921479031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1921479031 is about 43834.6784064854. The cubic root of 1921479031 is about 1243.2120658288.

The spelling of 1921479031 in words is "one billion, nine hundred twenty-one million, four hundred seventy-nine thousand, thirty-one".