1261451101 has 8 divisors (see below), whose sum is σ = 1337337344. Its totient is φ = 1187764560.

The previous prime is 1261451099. The next prime is 1261451161. The reversal of 1261451101 is 1011541621.

It is a happy number.

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 1261451101 - 2¹ = 1261451099 is a prime.

It is a super-2 number, since 2×1261451101² = 3182517760428224402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261451161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548745 + ... + 551038.

It is an arithmetic number, because the mean of its divisors is an integer number (167167168).

Almost surely, 2^1261451101 is an apocalyptic number.

It is an amenable number.

1261451101 is a deficient number, since it is larger than the sum of its proper divisors (75886243).

1261451101 is a wasteful number, since it uses less digits than its factorization.

1261451101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099851.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1261451101 is about 35516.9128866798. The cubic root of 1261451101 is about 1080.4967710635.

Adding to 1261451101 its reverse (1011541621), we get a palindrome (2272992722).

The spelling of 1261451101 in words is "one billion, two hundred sixty-one million, four hundred fifty-one thousand, one hundred one".