771481157 has 4 divisors (see below), whose sum is σ = 805023840. Its totient is φ = 737938476.

The previous prime is 771481141. The next prime is 771481169. The reversal of 771481157 is 751184177.

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: 751184177 = 9491 ⋅79147.

It is a cyclic number.

It is not a de Polignac number, because 771481157 - 2⁴ = 771481141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771481177) 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, 16771307 + ... + 16771352.

It is an arithmetic number, because the mean of its divisors is an integer number (201255960).

Almost surely, 2^771481157 is an apocalyptic number.

It is an amenable number.

771481157 is a deficient number, since it is larger than the sum of its proper divisors (33542683).

771481157 is a wasteful number, since it uses less digits than its factorization.

771481157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33542682.

The product of its digits is 54880, while the sum is 41.

The square root of 771481157 is about 27775.5496255250. The cubic root of 771481157 is about 917.1529649485.

The spelling of 771481157 in words is "seven hundred seventy-one million, four hundred eighty-one thousand, one hundred fifty-seven".