2690123261 has 4 divisors (see below), whose sum is σ = 3074426592. Its totient is φ = 2305819932.

The previous prime is 2690123257. The next prime is 2690123269. The reversal of 2690123261 is 1623210962.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1623210962 = 2 ⋅811605481.

It is a cyclic number.

It is not a de Polignac number, because 2690123261 - 2² = 2690123257 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 (2690123269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192151655 + ... + 192151668.

It is an arithmetic number, because the mean of its divisors is an integer number (768606648).

Almost surely, 2^2690123261 is an apocalyptic number.

It is an amenable number.

2690123261 is a deficient number, since it is larger than the sum of its proper divisors (384303331).

2690123261 is an equidigital number, since it uses as much as digits as its factorization.

2690123261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384303330.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 2690123261 is about 51866.3981880369. The cubic root of 2690123261 is about 1390.7766584191.

The spelling of 2690123261 in words is "two billion, six hundred ninety million, one hundred twenty-three thousand, two hundred sixty-one".