1262161391 has 8 divisors (see below), whose sum is σ = 1281696768. Its totient is φ = 1242675000.

The previous prime is 1262161387. The next prime is 1262161423. The reversal of 1262161391 is 1931612621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1262161391 - 2² = 1262161387 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 (1262161361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41486 + ... + 65156.

It is an arithmetic number, because the mean of its divisors is an integer number (160212096).

Almost surely, 2^1262161391 is an apocalyptic number.

1262161391 is a deficient number, since it is larger than the sum of its proper divisors (19535377).

1262161391 is an equidigital number, since it uses as much as digits as its factorization.

1262161391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24493.

The product of its digits is 3888, while the sum is 32.

The square root of 1262161391 is about 35526.9108001245. The cubic root of 1262161391 is about 1080.6995328007.

The spelling of 1262161391 in words is "one billion, two hundred sixty-two million, one hundred sixty-one thousand, three hundred ninety-one".