1351721145 has 16 divisors (see below), whose sum is σ = 2165651712. Its totient is φ = 719952000.

The previous prime is 1351721131. The next prime is 1351721183. The reversal of 1351721145 is 5411271531.

It is not a de Polignac number, because 1351721145 - 2⁵ = 1351721113 is a prime.

It is a super-2 number, since 2×1351721145² = 3654300107680222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48732 + ... + 71261.

It is an arithmetic number, because the mean of its divisors is an integer number (135353232).

Almost surely, 2^1351721145 is an apocalyptic number.

1351721145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1351721145 is a deficient number, since it is larger than the sum of its proper divisors (813930567).

1351721145 is a wasteful number, since it uses less digits than its factorization.

1351721145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120752.

The product of its digits is 4200, while the sum is 30.

The square root of 1351721145 is about 36765.7604980504. The cubic root of 1351721145 is about 1105.6789354918.

Adding to 1351721145 its reverse (5411271531), we get a palindrome (6762992676).

The spelling of 1351721145 in words is "one billion, three hundred fifty-one million, seven hundred twenty-one thousand, one hundred forty-five".