1551231441 has 24 divisors (see below), whose sum is σ = 2252839680. Its totient is φ = 1028556576.

The previous prime is 1551231379. The next prime is 1551231449. The reversal of 1551231441 is 1441321551.

1551231441 is a `hidden beast` number, since 1 + 5 + 512 + 3 + 144 + 1 = 666.

It is not a de Polignac number, because 1551231441 - 2¹³ = 1551223249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1551231449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2530251 + ... + 2530863.

It is an arithmetic number, because the mean of its divisors is an integer number (93868320).

Almost surely, 2^1551231441 is an apocalyptic number.

It is an amenable number.

1551231441 is a deficient number, since it is larger than the sum of its proper divisors (701608239).

1551231441 is a wasteful number, since it uses less digits than its factorization.

1551231441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1682 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1551231441 is about 39385.6755813583. The cubic root of 1551231441 is about 1157.6009278398.

Adding to 1551231441 its reverse (1441321551), we get a palindrome (2992552992).

The spelling of 1551231441 in words is "one billion, five hundred fifty-one million, two hundred thirty-one thousand, four hundred forty-one".