1621119977 has 4 divisors (see below), whose sum is σ = 1621236816. Its totient is φ = 1621003140.

The previous prime is 1621119943. The next prime is 1621120001. The reversal of 1621119977 is 7799111261.

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: 7799111261 = 4649 ⋅1677589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621119977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621119917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34283 + ... + 66464.

It is an arithmetic number, because the mean of its divisors is an integer number (405309204).

Almost surely, 2^1621119977 is an apocalyptic number.

It is an amenable number.

1621119977 is a deficient number, since it is larger than the sum of its proper divisors (116839).

1621119977 is a wasteful number, since it uses less digits than its factorization.

1621119977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116838.

The product of its digits is 47628, while the sum is 44.

The square root of 1621119977 is about 40263.1342172961. The cubic root of 1621119977 is about 1174.7308819612.

The spelling of 1621119977 in words is "one billion, six hundred twenty-one million, one hundred nineteen thousand, nine hundred seventy-seven".