1201025101 has 4 divisors (see below), whose sum is σ = 1201811104. Its totient is φ = 1200239100.

The previous prime is 1201025081. The next prime is 1201025107. The reversal of 1201025101 is 1015201021.

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: 1015201021 = 6007 ⋅169003.

It is a cyclic number.

It is not a de Polignac number, because 1201025101 - 2⁷ = 1201024973 is a prime.

It is a super-2 number, since 2×1201025101² = 2884922586464120402, 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 (1201025107) 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, 390705 + ... + 393766.

It is an arithmetic number, because the mean of its divisors is an integer number (300452776).

Almost surely, 2^1201025101 is an apocalyptic number.

It is an amenable number.

1201025101 is a deficient number, since it is larger than the sum of its proper divisors (786003).

1201025101 is an equidigital number, since it uses as much as digits as its factorization.

1201025101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786002.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1201025101 is about 34655.8090512976. The cubic root of 1201025101 is about 1062.9610753830.

Adding to 1201025101 its reverse (1015201021), we get a palindrome (2216226122).

The spelling of 1201025101 in words is "one billion, two hundred one million, twenty-five thousand, one hundred one".