1077697981 has 4 divisors (see below), whose sum is σ = 1112462464. Its totient is φ = 1042933500.

The previous prime is 1077697969. The next prime is 1077697987. The reversal of 1077697981 is 1897967701.

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 a cyclic number.

It is not a de Polignac number, because 1077697981 - 2⁹ = 1077697469 is a prime.

It is a super-2 number, since 2×1077697981² = 2322865876502952722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1077697987) 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, 17382195 + ... + 17382256.

It is an arithmetic number, because the mean of its divisors is an integer number (278115616).

Almost surely, 2^1077697981 is an apocalyptic number.

It is an amenable number.

1077697981 is a deficient number, since it is larger than the sum of its proper divisors (34764483).

1077697981 is an equidigital number, since it uses as much as digits as its factorization.

1077697981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34764482.

The product of its (nonzero) digits is 1333584, while the sum is 55.

The square root of 1077697981 is about 32828.3106632065. The cubic root of 1077697981 is about 1025.2560870348.

The spelling of 1077697981 in words is "one billion, seventy-seven million, six hundred ninety-seven thousand, nine hundred eighty-one".