1331977 has 4 divisors (see below), whose sum is σ = 1374976. Its totient is φ = 1288980.

The previous prime is 1331969. The next prime is 1331987. The reversal of 1331977 is 7791331.

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.

It is not a de Polignac number, because 1331977 - 2³ = 1331969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 42967 = 1331977 / (1 + 3 + 3 + 1 + 9 + 7 + 7).

It is a Duffinian number.

1331977 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1331987) 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, 21453 + ... + 21514.

It is an arithmetic number, because the mean of its divisors is an integer number (343744).

2^1331977 is an apocalyptic number.

It is an amenable number.

1331977 is a deficient number, since it is larger than the sum of its proper divisors (42999).

1331977 is an equidigital number, since it uses as much as digits as its factorization.

1331977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42998.

The product of its digits is 3969, while the sum is 31.

The square root of 1331977 is about 1154.1130793817. The cubic root of 1331977 is about 110.0269080178.

The spelling of 1331977 in words is "one million, three hundred thirty-one thousand, nine hundred seventy-seven".