1351311550 has 48 divisors (see below), whose sum is σ = 2660700240. Its totient is φ = 509725440.

The previous prime is 1351311527. The next prime is 1351311553. The reversal of 1351311550 is 551131531.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351311553) 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, 51514 + ... + 73186.

It is an arithmetic number, because the mean of its divisors is an integer number (55431255).

Almost surely, 2^1351311550 is an apocalyptic number.

1351311550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1351311550 is a deficient number, since it is larger than the sum of its proper divisors (1309388690).

1351311550 is a wasteful number, since it uses less digits than its factorization.

1351311550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21757 (or 21752 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 25.

The square root of 1351311550 is about 36760.1897437976. The cubic root of 1351311550 is about 1105.5672442315.

The spelling of 1351311550 in words is "one billion, three hundred fifty-one million, three hundred eleven thousand, five hundred fifty".