1977091 has 2 divisors, whose sum is σ = 1977092. Its totient is φ = 1977090.

The previous prime is 1977089. The next prime is 1977119. The reversal of 1977091 is 1907791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1977091 - 2¹ = 1977089 is a prime.

Together with 1977089, it forms a pair of twin primes.

It is an Ulam number.

1977091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1977991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988545 + 988546.

It is an arithmetic number, because the mean of its divisors is an integer number (988546).

2^1977091 is an apocalyptic number.

1977091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977091 is an equidigital number, since it uses as much as digits as its factorization.

1977091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 34.

The square root of 1977091 is about 1406.0906798639. The cubic root of 1977091 is about 125.5091975926.

The spelling of 1977091 in words is "one million, nine hundred seventy-seven thousand, ninety-one".