1202156541 has 6 divisors (see below), whose sum is σ = 1736448350. Its totient is φ = 801437688.

The previous prime is 1202156539. The next prime is 1202156561. The reversal of 1202156541 is 1456512021.

1202156541 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 1 + 5 + 654 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 964102500 + 238054041 = 31050^2 + 15429^2 .

It is not a de Polignac number, because 1202156541 - 2¹ = 1202156539 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 (1202156561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66786466 + ... + 66786483.

Almost surely, 2^1202156541 is an apocalyptic number.

It is an amenable number.

1202156541 is a deficient number, since it is larger than the sum of its proper divisors (534291809).

1202156541 is a wasteful number, since it uses less digits than its factorization.

1202156541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133572955 (or 133572952 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1202156541 is about 34672.1291673875. The cubic root of 1202156541 is about 1063.2947623338.

Adding to 1202156541 its reverse (1456512021), we get a palindrome (2658668562).

It can be divided in two parts, 120215 and 6541, that added together give a triangular number (126756 = T₅₀₃).

The spelling of 1202156541 in words is "one billion, two hundred two million, one hundred fifty-six thousand, five hundred forty-one".