77201381 has 4 divisors (see below), whose sum is σ = 77240064. Its totient is φ = 77162700.

The previous prime is 77201347. The next prime is 77201419. The reversal of 77201381 is 18310277.

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 a de Polignac number, because none of the positive numbers 2^k-77201381 is a prime.

It is a super-2 number, since 2×77201381² = 11920106456614322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77201681) 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, 16175 + ... + 20396.

It is an arithmetic number, because the mean of its divisors is an integer number (19310016).

Almost surely, 2^77201381 is an apocalyptic number.

It is an amenable number.

77201381 is a deficient number, since it is larger than the sum of its proper divisors (38683).

77201381 is a wasteful number, since it uses less digits than its factorization.

77201381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38682.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 77201381 is about 8786.4316420262. The cubic root of 77201381 is about 425.8026465054.

The spelling of 77201381 in words is "seventy-seven million, two hundred one thousand, three hundred eighty-one".