1001407156 has 6 divisors (see below), whose sum is σ = 1752462530. Its totient is φ = 500703576.

The previous prime is 1001407139. The next prime is 1001407159. The reversal of 1001407156 is 6517041001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 940035600 + 61371556 = 30660^2 + 7834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1001407156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001407159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125175891 + ... + 125175898.

Almost surely, 2^1001407156 is an apocalyptic number.

It is an amenable number.

1001407156 is a deficient number, since it is larger than the sum of its proper divisors (751055374).

1001407156 is a wasteful number, since it uses less digits than its factorization.

1001407156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250351793 (or 250351791 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1001407156 is about 31645.0178701166. The cubic root of 1001407156 is about 1000.4688321621.

Adding to 1001407156 its reverse (6517041001), we get a palindrome (7518448157).

The spelling of 1001407156 in words is "one billion, one million, four hundred seven thousand, one hundred fifty-six".