1551242313 has 8 divisors (see below), whose sum is σ = 2298136800. Its totient is φ = 1034161524.

The previous prime is 1551242309. The next prime is 1551242317. The reversal of 1551242313 is 3132421551.

It is an interprime number because it is at equal distance from previous prime (1551242309) and next prime (1551242317).

It is not a de Polignac number, because 1551242313 - 2² = 1551242309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 57453419 = 1551242313 / (1 + 5 + 5 + 1 + 2 + 4 + 2 + 3 + 1 + 3).

It is not an unprimeable number, because it can be changed into a prime (1551242317) 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, 28726683 + ... + 28726736.

It is an arithmetic number, because the mean of its divisors is an integer number (287267100).

Almost surely, 2^1551242313 is an apocalyptic number.

It is an amenable number.

1551242313 is a deficient number, since it is larger than the sum of its proper divisors (746894487).

1551242313 is an equidigital number, since it uses as much as digits as its factorization.

1551242313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57453428 (or 57453422 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1551242313 is about 39385.8136008386. The cubic root of 1551242313 is about 1157.6036322305.

Adding to 1551242313 its reverse (3132421551), we get a palindrome (4683663864).

The spelling of 1551242313 in words is "one billion, five hundred fifty-one million, two hundred forty-two thousand, three hundred thirteen".