1491977 has 2 divisors, whose sum is σ = 1491978. Its totient is φ = 1491976.

The previous prime is 1491967. The next prime is 1491979. The reversal of 1491977 is 7791941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1301881 + 190096 = 1141^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491977 - 2⁴ = 1491961 is a prime.

Together with 1491979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491977.

It is not a weakly prime, because it can be changed into another prime (1491979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745988 + 745989.

It is an arithmetic number, because the mean of its divisors is an integer number (745989).

2^1491977 is an apocalyptic number.

It is an amenable number.

1491977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491977 is an equidigital number, since it uses as much as digits as its factorization.

1491977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The square root of 1491977 is about 1221.4651038814. The cubic root of 1491977 is about 114.2669694703.

The spelling of 1491977 in words is "one million, four hundred ninety-one thousand, nine hundred seventy-seven".