1311950651 has 18 divisors (see below), whose sum is σ = 1461867372. Its totient is φ = 1167673320.

The previous prime is 1311950641. The next prime is 1311950713. The reversal of 1311950651 is 1560591131.

It is not a de Polignac number, because 1311950651 - 2¹⁰ = 1311949627 is a prime.

It is a super-3 number, since 3×1311950651³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311950641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8048696 + ... + 8048858.

It is an arithmetic number, because the mean of its divisors is an integer number (81214854).

Almost surely, 2^1311950651 is an apocalyptic number.

1311950651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311950651 is a deficient number, since it is larger than the sum of its proper divisors (149916721).

1311950651 is an frugal number, since it uses more digits than its factorization.

1311950651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 1311950651 is about 36220.8593354713. The cubic root of 1311950651 is about 1094.7270090862.

The spelling of 1311950651 in words is "one billion, three hundred eleven million, nine hundred fifty thousand, six hundred fifty-one".