1171657551 has 8 divisors (see below), whose sum is σ = 1571240880. Its totient is φ = 776589632.

The previous prime is 1171657541. The next prime is 1171657579. The reversal of 1171657551 is 1557561711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1171657551 - 2²² = 1167463247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171657511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1128246 + ... + 1129283.

It is an arithmetic number, because the mean of its divisors is an integer number (196405110).

Almost surely, 2^1171657551 is an apocalyptic number.

1171657551 is a deficient number, since it is larger than the sum of its proper divisors (399583329).

1171657551 is a wasteful number, since it uses less digits than its factorization.

1171657551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257705.

The product of its digits is 36750, while the sum is 39.

The square root of 1171657551 is about 34229.4836507944. The cubic root of 1171657551 is about 1054.2256174282.

The spelling of 1171657551 in words is "one billion, one hundred seventy-one million, six hundred fifty-seven thousand, five hundred fifty-one".