1011020403 has 16 divisors (see below), whose sum is σ = 1371820032. Its totient is φ = 662220000.

The previous prime is 1011020399. The next prime is 1011020441. The reversal of 1011020403 is 3040201101.

It is a happy number.

It is not a de Polignac number, because 1011020403 - 2² = 1011020399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011020473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26958 + ... + 52428.

It is an arithmetic number, because the mean of its divisors is an integer number (85738752).

Almost surely, 2^1011020403 is an apocalyptic number.

1011020403 is a deficient number, since it is larger than the sum of its proper divisors (360799629).

1011020403 is a wasteful number, since it uses less digits than its factorization.

1011020403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25706.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1011020403 is about 31796.5470295125. The cubic root of 1011020403 is about 1003.6600553184.

Adding to 1011020403 its reverse (3040201101), we get a palindrome (4051221504).

The spelling of 1011020403 in words is "one billion, eleven million, twenty thousand, four hundred three".