101155720 has 16 divisors (see below), whose sum is σ = 227600460. Its totient is φ = 40462272.

The previous prime is 101155693. The next prime is 101155723. The reversal of 101155720 is 27551101.

It can be written as a sum of positive squares in 2 ways, for example, as 97259044 + 3896676 = 9862^2 + 1974^2 .

It is a junction number, because it is equal to n+sod(n) for n = 101155691 and 101155700.

It is not an unprimeable number, because it can be changed into a prime (101155723) 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, 1264407 + ... + 1264486.

Almost surely, 2^101155720 is an apocalyptic number.

101155720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101155720 is an abundant number, since it is smaller than the sum of its proper divisors (126444740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101155720 is a wasteful number, since it uses less digits than its factorization.

101155720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528904 (or 2528900 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 101155720 is about 10057.6199967984. The cubic root of 101155720 is about 465.9401643595.

The spelling of 101155720 in words is "one hundred one million, one hundred fifty-five thousand, seven hundred twenty".