770149981 has 4 divisors (see below), whose sum is σ = 775250464. Its totient is φ = 765049500.

The previous prime is 770149973. The next prime is 770149987. The reversal of 770149981 is 189941077.

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: 189941077 = 397 ⋅478441.

It is a cyclic number.

It is not a de Polignac number, because 770149981 - 2³ = 770149973 is a prime.

It is a super-2 number, since 2×770149981² = 1186261986468600722, 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 (770149987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550015 + ... + 2550316.

It is an arithmetic number, because the mean of its divisors is an integer number (193812616).

Almost surely, 2^770149981 is an apocalyptic number.

It is an amenable number.

770149981 is a deficient number, since it is larger than the sum of its proper divisors (5100483).

770149981 is a wasteful number, since it uses less digits than its factorization.

770149981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100482.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 770149981 is about 27751.5761894708. The cubic root of 770149981 is about 916.6251512805.

The spelling of 770149981 in words is "seven hundred seventy million, one hundred forty-nine thousand, nine hundred eighty-one".