1345620551 has 36 divisors (see below), whose sum is σ = 1562717016. Its totient is φ = 1156858560.

The previous prime is 1345620487. The next prime is 1345620553. The reversal of 1345620551 is 1550265431.

It is not a de Polignac number, because 1345620551 - 2⁶ = 1345620487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345620553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12575840 + ... + 12575946.

It is an arithmetic number, because the mean of its divisors is an integer number (43408806).

Almost surely, 2^1345620551 is an apocalyptic number.

1345620551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1345620551 is a deficient number, since it is larger than the sum of its proper divisors (217096465).

1345620551 is a wasteful number, since it uses less digits than its factorization.

1345620551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1345620551 is about 36682.7009774362. The cubic root of 1345620551 is about 1104.0130417380.

Adding to 1345620551 its reverse (1550265431), we get a palindrome (2895885982).

The spelling of 1345620551 in words is "one billion, three hundred forty-five million, six hundred twenty thousand, five hundred fifty-one".