1662155231 has 4 divisors (see below), whose sum is σ = 1813260264. Its totient is φ = 1511050200.

The previous prime is 1662155221. The next prime is 1662155249. The reversal of 1662155231 is 1325512661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1662155231 - 2⁶ = 1662155167 is a prime.

It is a super-2 number, since 2×1662155231² = 5525520023881326722, 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 (1662155221) 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, 75552500 + ... + 75552521.

It is an arithmetic number, because the mean of its divisors is an integer number (453315066).

Almost surely, 2^1662155231 is an apocalyptic number.

1662155231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1662155231 is a deficient number, since it is larger than the sum of its proper divisors (151105033).

1662155231 is a wasteful number, since it uses less digits than its factorization.

1662155231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151105032.

The product of its digits is 10800, while the sum is 32.

The square root of 1662155231 is about 40769.5380277972. The cubic root of 1662155231 is about 1184.5603551063.

Adding to 1662155231 its reverse (1325512661), we get a palindrome (2987667892).

The spelling of 1662155231 in words is "one billion, six hundred sixty-two million, one hundred fifty-five thousand, two hundred thirty-one".