1361090991 has 32 divisors (see below), whose sum is σ = 2072025088. Its totient is φ = 788641920.

The previous prime is 1361090977. The next prime is 1361090993. The reversal of 1361090991 is 1990901631.

It is a happy number.

It is not a de Polignac number, because 1361090991 - 2¹¹ = 1361088943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361090993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29520 + ... + 59946.

It is an arithmetic number, because the mean of its divisors is an integer number (64750784).

Almost surely, 2^1361090991 is an apocalyptic number.

1361090991 is a deficient number, since it is larger than the sum of its proper divisors (710934097).

1361090991 is a wasteful number, since it uses less digits than its factorization.

1361090991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30511.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 1361090991 is about 36892.9666874324. The cubic root of 1361090991 is about 1108.2278328182.

The spelling of 1361090991 in words is "one billion, three hundred sixty-one million, ninety thousand, nine hundred ninety-one".