1612151231 has 4 divisors (see below), whose sum is σ = 1612254000. Its totient is φ = 1612048464.

The previous prime is 1612151221. The next prime is 1612151239. The reversal of 1612151231 is 1321512161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1612151231 - 2²² = 1607956927 is a prime.

It is a super-2 number, since 2×1612151231² = 5198063183229630722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1612151197 and 1612151206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612151239) 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, 22406 + ... + 61043.

It is an arithmetic number, because the mean of its divisors is an integer number (403063500).

Almost surely, 2^1612151231 is an apocalyptic number.

1612151231 is a deficient number, since it is larger than the sum of its proper divisors (102769).

1612151231 is an equidigital number, since it uses as much as digits as its factorization.

1612151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102768.

The product of its digits is 360, while the sum is 23.

The square root of 1612151231 is about 40151.6030937745. The cubic root of 1612151231 is about 1172.5604992098.

Adding to 1612151231 its reverse (1321512161), we get a palindrome (2933663392).

The spelling of 1612151231 in words is "one billion, six hundred twelve million, one hundred fifty-one thousand, two hundred thirty-one".